Mentor of Rhodes (Ancient Greek: Μέντωρ Ῥόδιος) (c. 385 BC – c. 340 BC) was a Greek mercenary and later Satrap of the Asiatic coast. He fought both for and against Artaxerxes III of Persia. He is also known as the first husband of Barsine, who later became a mistress to Alexander the Great.
In 358 BC, Mentor, along with his brother Memnon, were hired to provide military leadership by a rebel Persian satrap, Artabazus. Despite Mentor's capable leadership, the rebellion failed, and Artabazus, Barsine and Memnon fled to Macedon, where they were welcomed by Philip II. Mentor fled to Egypt.
Pharaoh Nectanebo II immediately enlisted the aid of the Greek mercenary, as he expected a Persian invasion was imminent. The pharaoh sent Mentor, at the head of 4000 mercenaries, to support Sidon, which had rebelled from Persia. Although Mentor won significant victories against some of the satraps, he was unable to defeat Artaxerxes' army, and was captured in 346 BC.
Upon his capture, Artaxerxes evidently recognized Mentor's skills, and pardoned him. Immediately, Mentor was sent to aid in the invasion of his former refuge, Egypt.
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