Amasis II
The incumbent pharaoh of Egypt was Amasis II, who had been ruling since 570. His ally, Polycrates, a Greek ruler of Samos, posed a considerable threat to the Achaemenids, launching several raids that jeopardized Achaemenid authority. However, Polycrates eventually forsook his Egyptian allies, and reached out to Cambyses, whose plans he was well acquainted with. His sudden change of alliances was undoubtly due to his uneasy position, with the Spartans raising a force against him, and the rising hostility of some of the Samian aristocrats, who preferred partnership with Egypt. Another former ally of Amasis II, the Carian military leader Phanes of Halicarnassus, had also joined Cambyses after escaping assassins sent by the pharaoh. Cambyses, before starting his expedition into Egypt, had seized Cyprus from Amasis II, which was reportedly a heavy blow to the latter.