Orchomenus ôrkŏm´ĭnəs [key], ancient city of Boeotia, central Greece, NW of Lake Copaïs. After 1600 BC it was an important center of the Mycenaean civilization . In later times the city was eclipsed by Thebes. Near Orchomenus, Sulla won (85 BC) a significant victory over Archelaus, general of Mithradates VI . Excavations on the site have been extensive. There was another Orchomenus in Arcadia, NW of Mantinea.

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