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The architecture of the Roman Odeion at Kos

The Roman Odeion at Kos was a covered rectangular building with four perimeter walls supporting the roof. The design of the koilon in the shape of a hoof follows Vitruvius' rules on Hellenistic theatres. The koilon was built with opus caementicium and it was supported by two vaulted stoas in a circular arrangement. The seats and the staircases were clad with marble. The stage has a peculiar pentagonal shape and its proscenium was rectilinear. The current form of the Odeion corresponds, in its entirety, to the ancient structure. A geometric tracing and a new restored plan of the koilon are presented. Finally, a date for the Odeion's construction in the first half of the second century AD is suggested.