First Achaemenid conquest of Egypt
The first Achaemenid conquest of Egypt took place in 525 BCE, leading to the foundation of the Twenty-seventh Dynasty of Egypt, also known as the "First Egyptian Satrapy" (). Egypt thus became a province (satrapy) of the Achaemenid Persian Empire until 404 BCE while still maintaining Egyptian royalty customs and positions. The conquest was led by Cambyses II, the King of Persia, who defeated the Egyptians at the Battle of Pelusium (525 BCE), and crowned himself as Pharaoh of Egypt. Achaemenid rule was disestablished upon the rebellion and crowning of Amyrtaeus as Pharaoh. A second period of Achaemenid rule in Egypt occurred under the Thirty-first Dynasty of Egypt (343–332 BCE). Origin of the conflict according to Herodotus Herodotus describes how Pharaoh Amasis II would eventually cause a confrontation with Persia. According to Herodotus, Amasis was asked by Cyrus the Great or Cambyses II for an Egyptian ophthalmologist on good terms. Amasis seems to have complied by forcing an Egyptian physician into mandatory labor, causing him to leave his family behind in Egypt and move to Persia in forced exile. In an attempt to exact revenge for this, the physician grew very close to Cambyses and suggested that Cambyses should ask