Agii Apostoli (Church of the Holy Apostles) is one of the oldest Christian churches in the area of the Ancient Greek Agora of Athens. Originally built in the 10th C. over a circular nymphaion (sacred spring) and subsequently much altered, it has been reconstructed in its original form. The exterior is notable for its good ashlar masonry and the ornamental use of Kufic inscriptions. The dome is borne on four columns, and the four apse and transepts have semicircular conches. There are well-preserved frescoes of Christ Pantocrator John the Baptist, cherubim and archangels.
