Adiabene was a state east of the Tigris, situated on the greater and lesser Zab in the territory of ancient Assyria.
Adiabene is associated with the careers of its king Izates and his mother Helena, who became Jews and took part in the Jewish-Roman wars before Jerusalem’s destruction.
Later Adiabene was absorbed into the Roman Empire and became one of six provinces forming the larger province of Assyria, although some writers used Adiabene for that larger province.