The Nubian kingdom to the south took full advantage of this division and the ensuing political instability. Prior to Piye's Year 20 campaign into Egypt, the previous Nubian ruler – Kashta – had already extended his kingdom's influence into Thebes when he compelled Shepenupet, the serving Divine Adoratrice of Amun and Takelot III's sister, to adopt his own daughter Amenirdis, to be her successor. Then, 20 years later, around 732 BC his successor, Piye, marched north and defeated the combined might of several native Egyptian rulers: Peftjaubast, Osorkon IV of Tanis, Iuput II of Leontopolis, and Tefnakht of Sais. This Dynasty was a short life-time dynasty, while Tefnakht I ruled from (732-725 BC), then Bakenranef (725-720 BC).