The Church of the Holy Apostles stands at an important crossroads in the southeast corner of the area of the ancient Agora. The earliest church on the site, built over a wall of the 5th-century B.C. Mint and the foundations of the Roman Nymphaeum, is here dated to the last quarter of the 10th century on the basis of its plan and details. The original plan was revealed as a tetraconch cross-in-square with dome on pendentives carried on arches supported by four freestanding columns, the west of the four apses penetrating into the narthex. Fifteen tombs of this first period were excavated under...