(ἀψίς; apsís). ‘Arch, vault’, Latin apsis or absida, cf. also exedra. Semicircular, sometimes polygonal, roofed architectural element, normally used as a closure or part of a room. Early proof in Aegean house architecture ( House); houses with an oblong rectangular plan closed at the rear by a semicircular apse can already be found in the lowest layers at Troy (Troy I a), in the entire Aegean Bronze Age and also in the Geometrical architecture of Greece (i.a. Antissa, Lefkandi, Lerna, Mycenae, Zagora/Andros) as …