The 25th dynasty of Egypt parallels the Egyptian third intermediate period from 1070-635 BC. Piankhi, the king of Kush, better known as Piye, laid the foundations of the 25th dynasty in 823-c.– 723 BCE in lower Egypt.
Egypt was under civil unrest with political instability throughout this time. The regional chieftains and elites were vying for power. As a Kushite king, Piye invaded Egypt from the south and ended the lower Egypt’s petty kingdoms.
The Conquests of the Kushite Empire