Perdiccas
State · 323–319 BCE · at its largest around 323 BCE
Lands under the regency of Perdiccas, who governed Alexander's empire after his death until his own officers murdered him during a failed invasion of Egypt.
On its lands while it lasted
- Uruk (c. 5,000 BCE – c. 700 CE): Sumerian city on the Euphrates that by about 3100 BCE was probably the largest city in the world, centre of the first urban civilization.
- Babylon (2,201 BCE – 1 CE): Capital of Babylonia (1800 BCE–601 BCE), Neo-Babylonian Empire (600 BCE–539 BCE), Achaemenid Empire (550 BCE–330 BCE).
More on Wikipedia.