Thirty-first Dynasty of Egypt
second and last Achaemenid rule on Egypt (343–332 BC)

The Thirty-first Dynasty of Egypt (notated Dynasty XXXI, alternatively 31st Dynasty or Dynasty 31), also known as the Second Egyptian Satrapy, was effectively a satrapy of the Achaemenid Empire between 343 BC to 332 BC. It was founded by Artaxerxes III, the King of Persia, after his reconquest of Egypt and subsequent crowning as Pharaoh of Egypt, and was disestablished upon the conquest of Egypt by Alexander the Great.
The period of the 31st Dynasty was the second occasion in which Persian pharaohs ruled Egypt, hence the term "Second Egyptian Satrapy". Before the 31st Dynasty was founded, Egypt had enjoyed a brief period of independence, during which three indigenous dynasties reigned (the 28th, 29th, and 30th dynasties). The period before this is referred to as the "First Egyptian Satrapy" or the 27th Dynasty (525–404 BC).
History
First Egyptian Campaign
In around 351 BC, Artaxerxes embarked on a campaign to recover Egypt, which had revolted under his father, Artaxerxes II. At the same time, a rebellion had broken out in Asia Minor, which, being supported by Thebes, threatened to become serious. Levying a vast army, Artaxerxes marched into Egypt, and engaged Nectanebo II. After a year of fighting the Egyptian Pharaoh, Nectanebo inflicted a crushing defeat on the Persians with the support of mercenaries led by the Greek generals Diophantus and Lamius. Artaxerxes was compelled to retreat and to postpone his plans to reconquer Egypt.
Second Egyptian Campaign
In 343 BC, Artaxerxes, in addition to his 330,000 Persians, had now a force of 8,000 Greeks furnished by the Greek cities of Asia Minor: 4,000 under Mentor, consisting of the troops which he had brought to the aid of Tennes from Egypt; 3,000 sent by Argos; and 1000 from Thebes. He divided these troops into three bodies, and placed at the head of each a Persian and a Greek. The Greek commanders were Lacrates of Thebes, Mentor of Rhodes and Nicostratus of Argos while the Persians were led by Rhossaces, Aristazanes, and Bagoas, the chief of the eunuchs.
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