21st Dynasty (Thebes)

The Theban 21st Dynasty was a series of High Priests of Amun who ruled Upper Egypt from Thebes under the Assyrian occupation, and afterwards. It followed the 20th and 23rd Dynasties, ruled concurrently with the 22nd, 21st (Tanis), and 25th Dynasties, and was followed by the Babylonian invasion. The dynasty ruled from 671 to 564 B.C., or 107 years. The priest-kings who ruled this dynasty were Herihor, Piankh, Pinudjem I, Menkheperre Piankhi, Smendes II, Pinudjem II, and Psusennes III.

The 21st Dynasty in Thebes began when the Assyrian army, under Esarhaddon, invaded Egypt and appointed the High Priest of Amun at Thebes (Herihor) to be commander of the Egyptian army. He ruled alongside Piankh, and died in 661 B.C. The job of priest-king of Upper Egypt was passed to Piankh's son, Pinudjem I.

Pinudjem I expelled the Assyrians in the last year of his reign, with the help of Piankhi. Menkheperre Piankhi then unified Egypt under his new 25th Dynasty, and went on many military campaigns until his death in 584 B.C. The three last kings of this dynasty were short-lived, ruling only until the Babylonian invasion of 564 B.C.

The evidence for the revised history can be found at Displaced Dynasties. Evidence regarding this dynasty specifically can be found here.