 Diodotus, governor for the Bactrian territory, asserted independence in around 245 BC, although the exact date is far from certain, to form the Greco-Bactrian Kingdom.This kingdom was characterized by a rich Hellenistic culture and was to continue its domination of Bactria until around 125 BC when it was overrun by the invasion of northern nomads.One of the Greco-Bactrian kings, Demetrius I of Bactria, invaded India around 180 BC to form the Indo-Greek Kingdoms.