Twenty-seventh Dynasty of Egypt
first Achaemenid rule on Egypt (525–404 BC)

The Twenty-seventh Dynasty of Egypt (notated Dynasty XXVII, alternatively 27th Dynasty or Dynasty 27), also known as the First Egyptian Satrapy (Old Persian: 𐎸𐎭𐎼𐎠𐎹, romanized: Mudrāya), was a satrapy of the Achaemenid Empire between 525 and 404 BC. It was founded by Cambyses II, the King of Persia, after the Battle of Pelusium (525 BC) and the Achaemenid conquest of Egypt, and his subsequent crowning as Pharaoh of Egypt. It 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 BC).
History
The last pharaoh of the Twenty-sixth Dynasty of Egypt, Psamtik III, was defeated by Cambyses II at the Battle of Pelusium in the eastern Nile Delta in May of 525. Cambyses was crowned pharaoh in the summer of that year at the latest, beginning the first period of Persian rule over Egypt, known as the 27th Dynasty. Egypt was then joined with Cyprus and Phoenicia to form the sixth satrapy of the Achaemenid Empire, with Aryandes as the local satrap (provincial governor).
As Pharaoh of Egypt, Cambyses' reign saw the fiscal resources of traditional Egyptian temples diminished considerably. One decree, written on papyrus in demotic script, ordered a limitation on resources to all Egyptian temples, excluding Memphis, Heliopolis and Wenkhem (near Abusir). Cambyses left Egypt sometime in early 522 BC, dying en route to Persia, and was nominally succeeded briefly by his younger brother Bardiya, although contemporary historians suggest Bardiya was actually Gaumata, an impostor, and that the real Bardiya had been murdered some years before by Cambyses, ostensibly out of jealousy. Darius I, suspecting this impersonation, led a coup against "Bardiya" in September of that year, overthrowing him and being crowned as King and Pharaoh the next morning.
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