Some time after the death of Osorkon III, Peftjauawybast proclaimed himself king, adopting a royal titulary and starting to date monuments since his "coronation", which should have occurred in around 749 BCE.

Peftjauawybast also married the princess Irbastudjanefu, a daughter of Rudamun, himself brother and successor of Takelot III, thus binding himself to the 23rd Dynasty.

The steles mention another wife, queen Tasheritenese, and a daughter, Iruatj, who was a Singer in the Interior of (the Domain of) Amun.

[1]: 325 Peftjauawybast appears on Piye's 'Victory stele' unearthed at Jebel Barkal, where he is depicted as one of the four "kings" submitted by the Kushite conqueror; the other were Osorkon IV of Tanis, Iuput II of Leontopolis and Nimlot of Hermopolis.

[5] His succession is obscure, since we have no records until the installation of Pediese as governor of Herakleopolis in the early 26th Dynasty, several decades later.