Eridu, perhaps the world’s first city, is founded in what is now Iraq

Story: 5400 B.C.E.  |  Last updated: January 8, 0001

Sometime around 5400 B.C.E., on the edge of the southern marshes where the Euphrates River spread into the land, people built a settlement that would endure for nearly five thousand years. They called it Eridu. Their descendants would call it the beginning of everything.

What the evidence shows

• Eridu ancient city: Founded around 5400 B.C.E. in what is now southern Iraq, Eridu is among the oldest continuously occupied urban settlements ever excavated — with archaeological layers tracing back to the Ubaid period, circa 6500 B.C.E.
• Sumerian King List: Ancient Sumerian texts name Eridu as the city where kingship first “descended from heaven,” treating it as the origin point of organized human civilization and political order.
• Temple archaeology: Excavations revealed a mud-brick temple to the god Enki dating to approximately 5500 B.C.E. — possibly the oldest known religious structure in Mesopotamian history, rebuilt repeatedly over thousands of years on the same site.

A city at the edge of the known world

Eridu sat at the meeting point of fresh water and marsh, at the southern edge of what we now call Mesopotamia — the land between the Tigris and Euphrates rivers in modern-day Iraq. The people who built it were part of the Ubaid culture, a remarkable civilization that spread across the region between roughly 6500 and 3800 B.C.E. and laid much of the foundation for everything that followed.

The site shows continuous occupation across an extraordinary span of time. Archaeologists digging through Eridu’s layers found not one city but dozens — each built on top of the last, as was common throughout ancient Mesopotamia. The deepest layers date to a time before writing, before metal tools, before anything we typically call civilization. And yet the people there had already begun building temples.

That first temple to the god Enki measured roughly 12 by 15 feet, made of mud brick, with a simple altar and a niche for a divine statue. Around the altar: fish bones and ash. Enki was the god of fresh water and wisdom, and his worshippers fed him well. Over the next three thousand years, that small room was rebuilt, expanded, and rebuilt again — each generation constructing on the sacred ground their parents had left them.

What Eridu meant to the ancient world

The ancient Sumerians had no doubt about what Eridu was. Their king lists, their myths, and their cosmologies all pointed to the same answer: this was where civilization began.

The Sumerian King List, one of the most important documents to survive from the ancient world, opens with a declaration: “After the kingship descended from heaven, the kingship was in Eridu.” The first kings ruled for spans of tens of thousands of years — numbers that signal myth, not history — but the underlying claim is consistent and deliberate. Eridu was the original home of order in a world that had once been chaos.

The city was never a powerful political capital. Scholars note that its importance was religious rather than governmental. What Eridu held was something harder to measure and longer lasting than political power: it was the spiritual center of a civilization’s self-understanding. When the later city of Uruk rose to eclipse Eridu in wealth and influence, Sumerian writers told the story of that transition as a myth — the goddess Inanna traveling to Eridu to receive the gifts of civilization from Enki, then carrying them home to Uruk. Even in losing ground, Eridu remained the source.

Stories that echoed across millennia

Two of the most consequential narratives in human history trace their earliest known roots to Eridu.

The first is the Great Flood. The Eridu Genesis, composed around 2300 B.C.E. but likely based on much older oral traditions, tells of a man named Ziusudra who builds a great boat and saves “the seed of life” at Enki’s instruction when the gods decide to destroy humanity. This story predates the biblical account of Noah by centuries, and the same character reappears in later Mesopotamian texts — as Atrahasis, and then as Utnapishtim in the Epic of Gilgamesh. Excavations at nearby Ur revealed an eight-foot layer of river silt consistent with a major Euphrates flood around 2800 B.C.E. — a local catastrophe, scholars emphasize, not a global one, but one large enough to anchor a story that would travel across cultures and millennia.

The second is the Garden. An early Eridu text tells of a gardener named Tagtug who eats forbidden fruit in a sacred garden and is cursed by Enki. The parallels to the later biblical Garden of Eden are deliberate: most scholars believe the Genesis narrative drew on this same tradition, filtering Mesopotamian myths through a new theological lens. Glass from Eridu has been found in the ruins of Egypt — a small, quiet reminder that the ancient world was more connected than it is often imagined to be.

Lasting impact

Eridu’s most durable contribution may be the idea of the city itself.

The shift it represented — from scattered agrarian villages to a concentrated settlement with a temple, a priestly class, shared institutions, and a civic identity — was one of the most significant transitions in human history. Urbanization did not happen all at once, and Eridu was not its only starting point. But it was among the earliest places where humans organized life around a shared center, and the model it established — temple at the heart, city around it, trade flowing in and out — became the template for dozens of cities that followed.

Under the rulers Ur-Nammu and Shulgi of Ur, around 2100 B.C.E., Eridu reached its monumental peak. A great ziggurat rose from the city’s center — its base measuring over 150 by 200 feet — dedicated not to military conquest but to the god of wisdom. The city attracted long-distance trade and a diversity of peoples. It was, at its height, something genuinely cosmopolitan.

The myths born at Eridu — about floods, paradise, forbidden knowledge, and the longing for immortality — rippled outward across the ancient Near East and eventually into the Hebrew Bible, shaping stories that billions of people still read today. The city itself was abandoned around 600 B.C.E., likely due to soil exhaustion and the retreat of the water table. It returned to the marsh and the sand. But the stories it generated never stopped moving.

Blindspots and limits

The designation “world’s first city” is contested. Other sites — including settlements in the Levant, the Indus Valley, and eastern Anatolia — show signs of early urban organization that may rival or predate Eridu’s founding, and the definition of “city” itself shapes which site gets the title. The Sumerian sources that elevate Eridu are also ideological documents, not neutral records: they were written by people for whom Eridu’s primacy was a theological claim, not an archaeological one. What we can say with confidence is that Eridu is among the oldest continuously occupied urban sites yet excavated — and that the people who built it knew they were doing something that mattered.

Read more

For more on this story, see: World History Encyclopedia — Eridu

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