Which kingdom did Sargon of Akkad rule, history's first empire?

Akkad, around 2300 BC - generally regarded as the first empire in the sense of a single ruler holding multiple previously independent city-states under one administration, with appointed governors, a standing army and a common language of government.

His own account, preserved on later tablets, says he was born in secret to a priestess who set him in a reed basket sealed with pitch and put him in the river, where a gardener found and raised him. The parallel with Moses is obvious and the Akkadian version is a thousand years older, which suggests a shared regional template for legitimising a ruler who cannot claim royal birth.

The city of Akkad itself has never been found. It was the capital of the first empire and its location is unknown - somewhere in central Mesopotamia, most likely under later occupation or shifted river silt. His daughter Enheduanna, whom he installed as high priestess at Ur, is the earliest person in history whose name is attached to their own writing, which makes this one family responsible for the first empire and the first named author.