 Chach was a Brahmin who rose to a position of influence under Rai Sahiras II, king of Sindh and a member of the Rai dynasty.Chach was given the appointments prime minister to the King, and retained influence after Rai Sahasi's death.He became the lover of Chach's widow, and their marriage enabled him to receive the kingship the date of which is normally put at 632 AD.