The English word “civilization” comes from Latin civitas, meaning “city”. Every history of civilization has to start somewhere with a first city, and that first city was in Mesopotamia. Everything else — writing, laws, wheeled transport, mass agriculture, standing armies, banking, mathematics, the 60-minute hour — comes downstream.

Mesopotamia means “between the rivers”, the Greek name for the fertile plain between the Tigris and Euphrates in what is now Iraq. It was not a single civilization but a sequence: Sumer, Akkad, Babylon, Assyria, then Persia, Greek, Parthian, Roman. Here is the full picture. For visitor logistics see our Iraq travel guide.

Why the two rivers mattered

The Tigris and Euphrates flood unpredictably (unlike the reliable Nile), so early Mesopotamians built irrigation canals to control water. That collective work — dug and maintained across generations — required organisation. Villages grew into towns, towns grew into cities, and by 3500 BC the world’s first true cities stood in southern Iraq: Uruk, Ur, Eridu, Lagash, Nippur.

Uruk at its peak (around 3100 BC) held perhaps 50,000 people, walled with a defensive perimeter of nine kilometres. Nothing on this scale had existed before, anywhere.

Sumer: the first cities

The Sumerians spoke a language unrelated to any other known human tongue. Where they came from is still debated. What they built is not. Between about 3200 and 2000 BC, they invented:

  • Cuneiform writing (scratched wedge-marks on clay tablets)
  • The wheel (probably first for pottery, then for wagons)
  • Bronze metallurgy at scale
  • The plough
  • Sailing ships
  • The sexagesimal (base-60) number system that still governs our clocks and compasses
  • Written law codes, well before Hammurabi
  • Standing armies and long-range trade networks reaching India

Their political shape was city-states — independent cities each with its own king and patron god. Ur worshipped Nanna the moon god; Uruk worshipped Inanna, goddess of love and war; Nippur worshipped Enlil, king of the gods. Wars between city-states were normal; empire came later.

Akkad: the first empire

Around 2334 BC, a king named Sargon of Akkad conquered Sumer and founded the first multi-ethnic empire in history. His capital, Akkad, has never been located archaeologically — one of the great missing sites of the ancient world. His empire held for about 180 years before collapsing under some combination of internal rebellion and climate stress (the same c. 2200 BC drought that ended Egypt’s Old Kingdom).

Sargon’s grandson Naram-Sin declared himself a god, the first Mesopotamian ruler to do so. Later Sumerian priests took a dim view.

Babylon: the first great capital

By 1800 BC power had shifted north to Babylon, a growing city on the Euphrates near modern Hilla. Its most famous king, Hammurabi (reigned 1792-1750 BC), unified southern Mesopotamia and issued the law code that bears his name (see our post on the Code of Hammurabi).

Babylon peaked much later, under Nebuchadnezzar II (605-562 BC), the same king who destroyed Solomon’s temple in Jerusalem and dragged the Jewish elite into what the Bible calls the Babylonian exile. Nebuchadnezzar rebuilt Babylon on a spectacular scale — the Ishtar Gate (now in Berlin’s Pergamon Museum), the Processional Way, and possibly the Hanging Gardens (see our Hanging Gardens post).

Assyria: the empire of iron

To the north sat Assyria, a hard mountain kingdom on the upper Tigris. From about 900 to 612 BC, Assyria built the largest empire the world had yet seen, running from Iran to Egypt at its peak under Ashurbanipal (668-627 BC). The Assyrians were the first to make systematic use of iron weaponry, siege engines, and mass deportation as an imperial policy — a fearsome combination that made them enormously effective and universally hated.

They also built one of the great libraries of antiquity. Ashurbanipal’s library at Nineveh held around 30,000 cuneiform tablets, including the only complete copy of the Epic of Gilgamesh, the world’s oldest surviving work of literature. Excavated by British archaeologists in the 1850s, most of the collection is now in the British Museum.

Assyria fell in 612 BC when a coalition of Medes, Babylonians and Scythians sacked Nineveh. The collapse was so complete that within two centuries, Greek travellers passing through the site had no idea a great capital had ever stood there.

Persia takes over

In 539 BC, Cyrus the Great of Persia conquered Babylon without a battle (see our Persian Empire post). Mesopotamia became a province of the Achaemenid empire, then of Alexander’s successor kingdoms, then of Parthia and Sasanian Persia. Local scribes went on writing cuneiform until around 75 AD — the last dated cuneiform tablet is an astronomical record from Babylon.

The Arab conquest of 636 AD brought Islam and Arabic. Baghdad, founded on the Tigris in 762 AD, became the capital of the Abbasid Caliphate and one of the largest cities on Earth. Ancient Mesopotamia had become medieval Iraq.

Visiting today

Iraq has stabilised significantly since 2018 and is slowly reopening to tourism. The southern sites (Ur, Uruk, Babylon) are all accessible again, and the northern sites (Nineveh, Nimrud, Hatra) are recovering after ISIS damage. As of 2026 many nationalities receive an e-Visa or visa-on-arrival.

  • Ur — the great ziggurat, restored in the 1980s, with the ruins of Abraham’s traditional birthplace nearby
  • Uruk (Warka) — the world’s first city, still evocative even in ruins
  • Babylon — much of what you see is Saddam-era reconstruction, but the layout and the lion of Babylon are original
  • Nineveh (near Mosul) — the walls and Ashurbanipal’s palace mound, damaged but recovering
  • Nimrud — the Assyrian capital before Nineveh, extensive restoration work ongoing
  • Hatra — Parthian-era caravan city, one of Iraq’s most striking ruins
  • Baghdad — the Iraq Museum houses the surviving treasures, including part of the Ur royal tombs

Check current safety advisories before booking. Individual travel is still challenging; guided small-group tours are the standard way in.

Frequently asked questions

Where was Mesopotamia?
Between the Tigris and Euphrates rivers, in what is now Iraq, plus parts of eastern Syria, southeastern Turkey and western Iran. The name is Greek and means “between the rivers”. The alluvial plain of southern Iraq was the heartland where the first cities appeared.
What did Mesopotamia invent?
A staggering amount: cities, cuneiform writing, the wheel, the plough, bronze metallurgy at scale, sailing ships, mathematics (including our base-60 clock and compass), written law codes, standing armies, long-distance trade, and — probably — beer. Most foundations of urban civilization were laid there between about 4000 and 2000 BC.
Who lived in Mesopotamia?
A succession of peoples over 4,000 years: Sumerians (unrelated to any known language family), Akkadians (Semitic, founded the first empire under Sargon), Babylonians and Assyrians (both Akkadian-speaking successors), then Persians, Greeks, Parthians, Sasanians and finally Arabs after the Islamic conquest of 636 AD.
Is Mesopotamia the same as Iraq?
Roughly yes. The heartland of ancient Mesopotamia — Sumer in the south, Babylon in the centre, Assyria in the north — all lies within modern Iraq. Portions of ancient Mesopotamia extend into modern Syria (Mari, Ebla), Turkey (Göbekli Tepe, Harran) and Iran.
Can you visit Iraq safely in 2026?
Iraq has stabilised significantly since 2018 and is slowly reopening to tourism. Small-group tours to the southern sites (Ur, Uruk, Babylon) run regularly. Northern Iraq (Nineveh, Nimrud, Hatra) is recovering after ISIS damage. Check your government’s current advisory before booking; some regions remain restricted.
What is the oldest city in the world?
Uruk in southern Iraq is usually considered the world’s first true city, reaching about 50,000 people by 3100 BC with defensive walls stretching 9 km. Other very early cities include Eridu, Ur and Çatalhöyük in Turkey. Some scholars argue for Jericho as an older urban settlement, though the population was much smaller.


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