In Greek mythology, Prothoenor (Greek: Προθοήνωρ) was one of the Greek leaders in the Trojan War, from Thespiae in Boeotia, son of Areilycus and Theobule, brother of Arcesilaus; he commanded eight ships. John Tzetzes makes him a son of Alector and Arteis, and thus a half-brother of Leitus and Clonius. According to the Iliad, he was killed by Polydamas, who immediately began to boast about it.
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