The simple design of the temple (a plain cella of modest dimensions, with a door on its east side) creates no problems for its representation. One building phase is represented, which includes the original 4th cent. BC edifice, together with the addition of the propylon, which is used for the Hellenistic phase. For the propylon we have accepted the theory attributing to the temple several parts of a Doric epistyle found incorporated in nearby buildings. During the Roman period, the only addition is the covering of the propylon’s floor with marble slabs [Hedrick Ch.W. Jr., ‘The Temple and Cult of Apollo Patroos in Athens’, American Journal of Archaeology 92 (1988), pp. 191-194].