1088 CE: Song Dynasty, China

In 1088, Kaifeng, the capital of China’s Northern Song dynasty, was one of the largest and most sophisticated cities on Earth. It sat at the center of a commercial economy supported by canals, roads, and maritime trade, in an era when Song innovations were changing what was possible in manufacturing, publishing, and science. Printed books were increasingly available, iron production was enormous by premodern standards, and paper money was in circulation. 

The year also brought two extraordinary technological milestones. The polymath Shen Kuo published his Dream Pool Essays, an encyclopedic work covering astronomy, mathematics, geology, medicine, and engineering. It contains one of the most important early descriptions of Chinese engineer Bi Sheng’s invention of movable-type printing, and discusses the magnetic compass and magnetic declination. At the same time, the engineer and astronomer Su Song was developing an enormous astronomical clock tower. A wooden prototype was completed in 1088, and the full water-powered tower — which incorporated sophisticated mechanisms for astronomical observation and timekeeping — was completed several years later. For an educated resident of Kaifeng, the combination of commerce, government, and technology was remarkably advanced for the 11th century.

1324 CE: Mali Empire, West Africa 

In 1324, the Mali Empire was at the height of its power under Mansa Musa, who became legendary for his vast wealth. Mali controlled major gold-producing regions and important portions of the trans-Saharan trade network, linking West African markets with North Africa and the wider Islamic world. The empire’s prosperity also benefited from a system of commerce that moved salt, textiles, horses, metals, and other goods across the Sahara.

The defining event of the year was Musa’s pilgrimage to Mecca. He traveled with an enormous caravan that included thousands of people and vast quantities of gold, passing through Cairo on the journey. Accounts from the period and later histories emphasize the extraordinary scale of his spending there, which was so extensive that contemporary accounts reported a decline in the value of gold in Cairo for 12 years. 

After his return, Musa invested in Mali’s religious and intellectual life, helping strengthen cities such as Timbuktu as important centers of trade and learning, at great benefit to many merchants, scholars, and courtiers.

1508 CE: Rome, Italy 

For an artist or intellectual with the right connections, Rome in 1508 was an exciting place to be. Pope Julius II used the resources of the papacy to transform the city, and some of the greatest artists of the Renaissance arrived to work on his projects. That year, Michelangelo signed the contract for the decoration of the Sistine Chapel ceiling. What began as a relatively modest commission for figures of the apostles became the vast fresco cycle that occupied the artist until 1512, including the scenes from Genesis that became some of the most recognizable images in Western art.

Raphael was also in Rome by this period, having arrived at Julius II’s invitation to decorate the papal apartments, producing such frescoes as “The School of Athens.” At the same time, Donato Bramante was overseeing Julius II’s ambitious rebuilding of St. Peter’s Basilica, which started in 1506. The result was a city alive with Renaissance artists drawing inspiration from the remains of ancient Rome while developing new approaches of their own. For someone fortunate enough to move in elite artistic or intellectual circles, 1508 offered the extraordinary possibility of watching Michelangelo, Raphael, and Bramante reshape Rome.

1605 CE: Mughal India 

In 1605, the Mughal Empire stood at the end of one remarkable reign and the beginning of another. Emperor Akbar, who had ruled since 1556, died in October, and his son Jahangir succeeded him. The transition followed years of tension between father and son, but the succession did not fracture the empire. Instead, it marked a shift between two emperors who would become major patrons of Mughal art and culture.

Akbar had built a court where Persian, Indian, and European influences mingled. Beginning in the 1570s, his translation bureau oversaw Persian versions of major Sanskrit epics, including the Mahabharata and Ramayana, while imperial artists created lavishly illustrated manuscripts. Jahangir later took that artistic interest even further, becoming an especially enthusiastic patron of portraits, animals, and natural history. In 1605, an observer at the Mughal court could witness one extraordinary cultural era giving way to another. Jahangir’s accession marked a new chapter in Mughal cultural life, building on the extraordinary artistic and literary achievements of his father’s reign while opening the door to new forms of artistic innovation.

The Case for Khafre

Most archaeologists believe the Sphinx was built around 4,500 years ago during Egypt’s Old Kingdom, under the reign of King Khafre (also called Chephren). Khafre ruled from about 2558 to 2532 BCE and is credited with building the second of the three pyramids at Giza.

Why do many experts suspect the Sphinx was commissioned by Khafre? For starters, the monument is part of a complex that includes Khafre’s pyramid and temples. And a life-size statue of Khafre, carved from volcanic rock and found in an adjacent temple, bears some resemblance to the face of the Sphinx. A stone ceremonial pathway within the complex also suggests a connection, as it links the temple next to the Sphinx to a mortuary temple next to Khafre’s pyramid.

Additionally, an inscription known as the Dream Stela, placed between the Sphinx’s paws by Pharaoh Thutmose IV more than a thousand years after Khafre’s time, asks the people of Egypt to worship the “resting place or sanctuary of … Khaef,” a name that has been interpreted as Khafre. While not conclusive proof, this has strengthened the Khafre theory in the eyes of many scholars.

Could Khufu Have Been the Builder?

Yet not everyone agrees that Khafre was the mastermind behind the Sphinx. Some researchers argue that it was actually Khafre’s father, King Khufu — the builder of the Great Pyramid of Giza — who commissioned the statue.

This theory draws on geological and archaeological clues. The Sphinx was carved from a limestone outcrop that may have been quarried during Khufu’s construction projects. Also, some archaeologists suggest that Khafre’s causeway and temples appear to be designed around the already-existing Sphinx, indicating the statue predated his reign.

Stylistic comparisons fuel the Khufu hypothesis as well. The broad, square features of the Sphinx’s face don’t match well with Khafre’s statues. Instead, some experts see a closer resemblance to known images of Khufu.

Alternative Theories

Other candidates have been proposed, though with less evidence. Khafre’s brother Djedefre and son Menkaure have both been suggested as possible builders. Djedefre in particular is thought to have commissioned smaller sphinxes at his own pyramid complex.

An even more radical theory proposes that the Sphinx is much older than the Old Kingdom — perhaps dating back to 7000 BCE — based on interpretations of erosion patterns. However, this idea is largely dismissed by mainstream Egyptologists.

Some have also argued that certain features of the Sphinx’s headdress resemble those seen during the reign of Amenemhat II, about six centuries after Khafre. Yet this view remains on the fringes of academic debate.

A Statue by Any Other Name

Interestingly, the name “Sphinx” comes not from ancient Egypt, but from the ancient Greeks, who visited the site more than 2,000 years after the statue was built. They likely named it for its resemblance to their mythical sphinx — a creature with a woman’s head, a lion’s body, and an eagle’s wings.

The ancient Egyptians, by contrast, may have called the statue Horemakhet, meaning “Horus of the horizon,” linking it to the sky god Horus and reinforcing its role as a symbol of divine kingship and protection.

While the debate over who built the Sphinx continues, the monument’s grandeur and significance are undisputed. Whether the work of Khafre, Khufu, or another long-ago ruler, the Sphinx remains a powerful symbol of ancient Egypt’s ingenuity, artistry, and fascination with the afterlife. We can only hope it will endure for another 4,000 years.

Healing and Transformation

For many ancient people, especially those in the Greco-Roman world, dreams were not only forecasts but also instructions for therapy. The prominent Greek physician Galen reported that he had performed surgery based on instructions received in a dream. (In fact, Galen owed his entire career to a dream his father had.)

In Roman times, the orator Aelius Aristides kept extensive dream journals detailing his interactions with the god Asclepius, the god of healing. In his first such dream, the deity directed him to walk barefoot in cold weather. Aristides also wrote of being instructed to plunge into a freezing river in winter. Despite the bitter cold, he followed the divine command and emerged feeling renewed, with a “certain inexplicable contentment” that lasted through the day and night.

The temple of Asclepius in Pergamum, where Aristides spent years undergoing dream-based treatments, was a center of “incubation” — a practice in which patients slept in the temple in hopes of receiving a healing dream, or simply being healed by the god while they slept. Aristides believed his ailments were not only healed through these dreams, but that the dreams themselves revealed a deeper layer of his identity.

Symbol and Allegory

Not all dreams in the ancient world were seen as straightforward. Some were symbolic puzzles requiring interpretation. The second-century dream theorist Artemidorus, in his book Oneirocritica (or The Interpretation of Dreams), distinguished between direct (“theorematic”) and allegorical dreams. The former might show you exactly what was coming (for instance, dreaming of a shipwreck and waking up to discover it coming true), but the latter cloaked meaning in metaphor.

In symbolic dreams, one thing signified another — an eagle could mean a king; a journey, an impending change; a flood, internal unrest. Interestingly, interpretation relied not on fixed meanings but on context, such as who the dreamer was as well as their emotional state, social status, health, and personal concerns.

Dreams and Literature

Dreams also fed ancient literature and drama. The playwright Aristarchus of Tegea reportedly wrote a tragedy at the command of the god Asclepius, who appeared in a dream after the playwright’s recovery from illness.

Homer’s famous epics are also infused with dream logic and imagery. In the Iliad Book 2, Zeus sends a deceitful dream to Agamemnon in the form of a person urging him to attack Troy. It’s an example of dreams as political tools used by gods to shape human affairs.

The Importance of Ancient Dreams

Of course, not everyone in the ancient world took dreams so seriously. In the fourth century CE, the philosopher Diogenes the Cynic had this to say about people who got worked up about dreams: “They did not regard what they do while they are awake, but make a great fuss about what they fancy they see while they are asleep.”

Yet as with most things, Diogenes was an outlier. For many in the ancient world, dreams were seen as legitimate and often essential tools for navigating illness, ethics, and divine will. Ancient people dreamed of gods and ghosts, rivers and birds, death and healing, fear and redemption. And whether interpreted as prophecy, therapy, or metaphor, those dreams were treated with reverence and awe.

Art and Storytelling Flourished

The Bronze Age saw an explosion of creativity that, like most aspects of the era, varied by region as civilizations developed at different speeds and with their own styles and techniques. In Mesopotamia (around modern-day Iraq), sculptors carved detailed figures from stone and bronze, while in the Aegean world, particularly among the Minoans on the island of Crete (in modern-day Greece), pottery was a canvas as much as it was a vessel. Even everyday items such as frying pans were detailed with elegant nature scenes and designs. Bronze bells, meanwhile, were a staple of musical rituals in late Bronze Age China, around 1050 BCE, believed to symbolize virtue.

It was also, despite limited writing systems, a significant time for literature. The most famous work to survive from the Bronze Age — and one of the oldest surviving works of literature — is The Epic of Gilgamesh. First written on clay tablets in cuneiform in ancient Sumer around 2100 BCE, the story follows the tale of Gilgamesh, the king of the city of Uruk. The story and its themes of mortality, Mesopotamian religious beliefs, and societal values are considered foundational aspects of the heroic epic genre.

Civilizations Rose

Permanent settlements and early cities existed long before the Bronze Age, but the era saw the rise of the first organized and complex urban societies. These were densely populated, politically organized, and connected through trade, communication, and technologies such as the mastery of bronze metallurgy and irrigation systems. 

In Mesopotamia — often called the cradle of civilization — the Sumerian city-state Uruk flourished in 3500 BCE. Estimates of its population vary, but at its peak, it’s thought to have been home to between 50,000 and 80,000 people. It introduced key features of urban life: monumental temples that doubled as religious and administrative centers, a centralized government led by priests and kings, and the invention of cuneiform writing for managing trade and resources. The cities of Babylon and Nineveh later expanded these innovations, developing vast trade networks and astronomical records. The Babylonians also pioneered a comprehensive legal system with the Code of Hammurabi, established around 1750 BCE.

In South Asia, the Indus Valley Civilization (modern-day Pakistan and North India) planned cities such as Harappa and Mohenjo-Daro with remarkable precision, with uniform brickwork, public baths, and complex drainage that set the standard for urban sanitation. In the Aegean, the Minoans on Crete built a 150,000-square-foot palace complex in the city of Knossos, and were pioneers of maritime trade and early syllabic writing systems.

Religion and Ritual Shaped Everyday Life

In the Bronze Age, religion was often observed at temples, but it certainly wasn’t confined to them. Religion and its accompanying rituals were woven throughout much of daily life, as most people believed their fates were influenced by supernatural forces. In regions such as ancient Britain, where the Bronze Age started around 2500 BCE, communities such as the Beaker people held sacrifices to the gods at stone circles. In Egypt, meanwhile, religious life centered around the afterlife: Massive tombs and ornate burial customs demonstrated a belief in a world after death. Bronze Age religious spaces were often natural sites, too: The River Thames, for instance, served as a sacred place where people left thousands of objects, believed to be offerings to its spirit.

It Collapsed Fairly Quickly

After thriving for centuries, the advanced and interconnected civilizations of the Bronze Age began a collapse sometime around 1200 BCE that took just a few decades, ending in about 1150 BCE. Cities across the eastern Mediterranean were abandoned or destroyed and trade routes crumbled. In Mycenaean Greece, palace complexes were destroyed. The Hittite Empire in Anatolia (modern-day Turkey) vanished. Even Egypt, though it partially survived, was badly weakened and never regained its former power. 

Historians have pointed to a variety of potential and overlapping causes, including drought, famine, earthquakes, and invasion, but the scale and suddenness of the collapse is difficult to fully account for. Though the Bronze Age collapse was sudden in the timeline of history, its impact was long-lasting. Many regions entered a so-called “dark age,” with fewer historical records — writing systems such as the Aegeans’ Linear B vanished — and simpler societies. The shadow lingered until the Iron Age was well established in many regions by around 1000 BCE. Iron was more accessible than copper, and using it to make steel meant tools and weapons were stronger. A boost in agriculture helped population growth, fueling the rise of new states and the gradual return of urban life, trade, and culture.

Midday

By late morning, the farmer was busy in the fields. Whether plowing, sowing, or harvesting, they often sang songs or worked alongside the rest of the family, making the long hours a bit more bearable. Animals were fed, irrigation channels were checked, and grain was carefully stored for the future. The work was physically demanding, with little time for breaks, except perhaps a short midday rest and a quick snack.

Meanwhile, the pharaoh’s day was generally filled with matters of state. They met with high-ranking officials, reviewed reports from distant provinces, and made important decisions about military strategies, construction projects, or new decrees — decisions that scribes quickly recorded. The pharaoh was seen as a living god, and as such their duties were deeply connected to religion. They often visited temples or oversaw grand state ceremonies, all designed to maintain ma’at — the divine balance that kept the universe in harmony.

The scribe’s midday looked a bit different. Sitting cross-legged with a papyrus scroll on their lap, they might have copied tax records, written land deeds, or transcribed religious texts, using reed pens and ink. In addition to their writing tasks, they might have overseen operations at a grain warehouse, checked inventories, or accompanied inspectors to ensure tax compliance in the nearby villages.

Afternoon

As the afternoon sun climbed higher, the farmer pressed on with their work. They might have reinforced irrigation dikes, tended to livestock, or gathered reeds (to make baskets or mats) or papyrus (to make paper) along the Nile. The river shaped every part of their world — its annual flooding, known as inundation, could wash away homes, but it also left behind rich, fertile soil that made farming possible. During the months when fields were underwater, many farmers were called to help with state projects such as digging canals or even working on temple construction. 

The scribe’s afternoon sometimes took them away from their writing board and out into the field. They often accompanied officials to survey land, checked on tax records, and delivered documents between government offices. Scribes were responsible for various administrative tasks, including recording census data, managing tax records, and drafting legal documents. 

Scribes didn’t live in luxury, but their education offered them a level of stability and social status that few others had. Even with long hours and modest pay, the role came with opportunity — scribes could ascend the ranks of bureaucracy, with some rising to prominent positions such as vizier (a high-ranking political official) or even pharaoh, such as Horemheb in the 14th century BCE.

Meanwhile, the pharaoh’s duties extended into the afternoon with ceremonies, council meetings, or visits to key sites. Their duties included touring construction projects, presiding over temple rituals, and meeting with diplomats bearing gifts and tributes. Even when they weren’t issuing decrees or overseeing matters of state, their presence carried symbolic weight — every move reinforcing their divine role in maintaining harmony across the land.

Evening 

As evening settled over Egypt, the pace of daily life slowed. The farmer returned to their mud-brick home, tired from the day’s labor, and often sat down to a simple meal with the family — lentils, flatbread, vegetables, and, if they were fortunate, some fish or duck. The evening hours were quiet, filled with conversation, stories, and a bit of rest before the cycle began again at dawn.

The scribe’s work came with some comforts, but their schedule was still shaped by the responsibilities of recordkeeping and administration. They ended their long work day by cleaning their tools and putting away scrolls. At home in their apartment complex near the mortuary or temple, they might have dined on a dinner of vegetables, bread, meat, and beer and then spend time reading, writing, or relaxing with music and family.

Even with the privileges of royalty, the pharaoh’s day often followed a similar rhythm of tradition, ceremony, and decision-making. At the vibrantly decorated palace, the ruler’s dinner was an elaborate affair, prepared by a team of cooks and often served alongside music and entertainment. Afterward, they sometimes meet with priests or advisers, or simply wound down in private quarters for the night.

622 CE

The foundation of Islam is unusually well documented compared to other major religions. In 610 CE, the Prophet Muhammad received his first revelation, marking the birth of the religion. Then, in 622 CE, he completed his migration from Mecca to Medina — known as the Hijra — transforming a small religious movement into a unified community that became the foundation of the Islamic state. 

Within a century of the Hijra, Islam had expanded from Spain to the borders of China. The Islamic civilization grew to become a global powerhouse for roughly a millennium, at the forefront of trade, invention, and innovation. Islamic scholars flourished, turning the civilization into the leading center for science, medicine, philosophy, astronomy, math, and more, reshaping the intellectual, economic, and political architecture of the globe.

1492

For the whole of human history until the late 15th century, the Eastern and Western hemispheres had largely evolved in isolation. That separation ended forever after Christopher Columbus made landfall in what is now the Bahamas on October 12, 1492. What followed — now known as the Columbian Exchange — was one of the most transformative social and ecological events in history. Crops, animals, and diseases moved in both directions. Old World illnesses may have killed as many as 90% of the pre-Columbian population within a century. European colonialism followed, reshaping the entire world. No single voyage in history had greater consequences for more people.

1760

Historians disagree as to precisely when the Industrial Revolution began, but textbooks typically put the start around 1760. It was a pivotal year, with agrarian economies giving way to a world dominated by industry, machine manufacturing, and coal. Mills and steam engines, and technologies such as the spinning jenny, brought about the mechanization of manufacturing, which in turn led to the rise of the factory system, railways, steamships, rapid growth of cities, and ultimately modern global capitalism. Perhaps no development since the agricultural revolution altered the conditions of human existence to such an extent — and the environmental consequences, including large-scale carbon emissions and the transformation of ecosystems, are still unfolding today. 

1945

When World War II ended in 1945, it didn’t only mark the conclusion of the deadliest conflict in human history. It ended the era of European global dominance that had begun with Columbus in 1492. For the exhausted, financially ruined European powers — most notably Great Britain and France — the end of the war marked the beginning of the decline of their colonial empires. 

That same year, the United Nations was founded and the Cold War began. Two superpowers — the United States and the Soviet Union — divided the world into competing spheres that fundamentally changed the political outlook of the world. The end of the war had introduced a permanent new condition into human affairs: the possibility of civilizational self-destruction. When the atomic bomb was dropped on Hiroshima on August 6, 1945, the world opened its eyes to a stark new reality that has shaped every geopolitical calculation from that moment until the present day. 

Honorable Mentions

~10,000 BCE

No single year in the prehistoric period can be pinpointed precisely, but around 10,000 BCE, human communities began cultivating crops and domesticating animals. The agricultural revolution produced food surpluses, making possible larger populations, specialized labor, trade, writing, cities, armies, and governments. 

~3200 BCE

The development of cuneiform script in ancient Mesopotamia was arguably the single most consequential intellectual development in human history, making it possible to record laws, coordinate trade, accumulate knowledge across generations, administer complex states, and record history itself. 

539 BCE

The Persian conquest of Babylon by Cyrus the Great created the first true superpower civilization, linking the Mediterranean, Near East, Central Asia, and South Asia under a single administration.

1206 

Genghis Khan’s unification of the Mongols launched one of the largest contiguous land empires in history. It was enormously destructive — the sack of Baghdad in 1258 ended the Islamic golden age — but the Pax Mongolica also created the first transcontinental trade network, opening sustained exchange between the East and West.

1789

When the French Revolution began with the storming of the Bastille, it ended the French monarchy and promulgated the ideology of liberty, equality, and popular sovereignty across Europe and beyond. The revolution played a large part in ending the divine right of kings as a governing principle and set the template for democratic revolutions for the next two centuries.

1859

No book of the 19th century did more to reshape human understanding of our place in nature than Charles Darwin’s “On the Origin of Species,” published in 1859. Darwin’s theory of evolution by natural selection transformed biology, medicine, and our understanding of human origins, while challenging the religious and philosophical frameworks that had long governed Western thought.

How the Ancients Shaped the Week

The seven-day week has endured for thousands of years, surviving empires, revolutions, religious shifts, and even a few determined attempts to replace it. Its origins lie in a mix of astronomy, astrology, religion, and ancient practicality — with a healthy dose of historical debate.

Many historians trace the roots of the seven-day week to ancient Mesopotamia, home to some of the world’s earliest astronomers. The Babylonians closely observed the sky and attached special importance to the number seven, partly because they recognized seven major celestial bodies moving independently: the sun, the moon, Mercury, Venus, Mars, Jupiter, and Saturn. Today, we know the sun and moon aren’t planets, but in the ancient world they were grouped together with the five planets visible to the naked eye. 

The Babylonians also used a lunar calendar, and the phases of the moon may have helped shape the structure of the week. A full lunar cycle lasts about 29.5 days, which can be divided into four roughly seven-day phases. Some scholars believe Mesopotamian societies, including the Sumerians and Babylonians, used these quarter-moon intervals as the basis for a recurring seven-day cycle, and this is one basis for our current week.

However, scholars continue to debate exactly how much the modern week is influenced by this Babylonian practice versus by ancient Jewish tradition. The biblical creation story helped cement the importance of the number seven in Jewish culture: According to Genesis, God created the world in six days and rested on the seventh. That seventh day became the Sabbath, a recurring day of rest and worship. Unlike many earlier calendars tied directly to lunar phases, the Jewish week evolved into a continuous repeating cycle independent of the moon.

The Romans initially followed a different system entirely. For centuries, Roman civil life revolved around an eight-day market cycle. But as astrology from the eastern Mediterranean spread through the Roman Empire, the seven-day planetary week became increasingly popular. Each day was associated with one of the seven classical planets.

How We Got to Seven Days

In 321 CE, Roman Emperor Constantine officially established the seven-day week in the Roman calendar, helping spread it across Europe. Some of those planetary names still survive in English today. Sunday honors the sun, Monday the moon, and Saturday Saturn. The names for the other weekdays reflect Anglo-Saxon names for Norse deities. Tuesday comes from Tiw, a Norse war god linked with Mars. Wednesday honors Odin (or Woden), associated with Mercury. Thursday derives from Thor, connected with Jupiter, while Friday honors Frigg, tied to Venus.

Not every culture embraced seven-day weeks, however. Ancient Egypt sometimes used 10-day cycles, while parts of West Africa followed four-day market weeks. Revolutionary governments also occasionally tried to reinvent the calendar. During the French Revolution, reformers introduced a 10-day week intended to break with religious tradition and make timekeeping more “rational.” (All the days and months were named after elements in nature.) Soviet officials later experimented with five-day and six-day workweeks in an effort to maximize industrial productivity; the days were even color-coded. Neither experiment lasted.

The persistence of the seven-day week is remarkable, considering how arbitrary the unit really is. Unlike days, months, or years, a week is fundamentally a human invention — one shaped by ancient sky-watchers and thousands of years of habit.