Orchomenus ôrkŏmˈĭnəs [key], ancient city of Boeotia, central Greece, NW of Lake Copaïs. After 1600 b.c. it was an important center of the Mycenaean civilization. In later times the city was eclipsed by Thebes. Near Orchomenus, Sulla won (85 b.c.) 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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