Psamtik reunified Egypt in his ninth regnal year when he dispatched a powerful naval fleet in March 656 BC to Thebes and compelled the existing God's Wife of Amun at Thebes, Shepenupet II, daughter of the former Kushite Pharaoh Piye, to adopt his daughter Nitocris I as her heiress in the so-called Adoption Stela.

Psamtik's victory destroyed the last vestiges of the Nubian Twenty-fifth Dynasty's control over Upper Egypt under Tantamani since Thebes now accepted his authority.
Nitocris would hold her office for 70 years from 656 BC until her death in 585 BC.
Thereafter, Psamtik campaigned vigorously against those local princes who opposed his reunification of Egypt.
One of his victories over certain Libyan marauders is mentioned in a Year 10 and Year 11 stela from the Dakhla Oasis.

Psamtik won Egypt's independence from the Assyrian Empire and restored Egypt's prosperity during his 54-year reign.
The pharaoh proceeded to establish close relations with archaic Greece and also encouraged many Greek settlers to establish colonies in Egypt and serve in the Egyptian army.
In particular, he settled some Greeks at Tahpanhes (Daphnae).
Psamtik reunified Egypt in his ninth regnal year when he dispatched a powerful naval fleet in March 656 BC to Thebes and compelled the existing God's Wife of Amun at Thebes, Shepenupet II, daughter of the former Kushite Pharaoh Piye, to adopt his daughter Nitocris I as her heiress in the so-called Adoption Stela. 
Psamtik's victory destroyed the last vestiges of the Nubian Twenty-fifth Dynasty's control over Upper Egypt under Tantamani since Thebes now accepted his authority. Nitocris would hold her office for 70 years from 656 BC until her death in 585 BC. Thereafter, Psamtik campaigned vigorously against those local princes who opposed his reunification of Egypt. One of his victories over certain Libyan marauders is mentioned in a Year 10 and Year 11 stela from the Dakhla Oasis. 
Psamtik won Egypt's independence from the Assyrian Empire and restored Egypt's prosperity during his 54-year reign. The pharaoh proceeded to establish close relations with archaic Greece and also encouraged many Greek settlers to establish colonies in Egypt and serve in the Egyptian army. In particular, he settled some Greeks at Tahpanhes (Daphnae).
Psamtik I