At Philippi, the market adjoining the 1st-century forum was demolished and replaced with a Christian basilica. Civic basilicas throughout Asia Minor became Christian places of worship; examples are known at Ephesus, Aspendos, and at Magnesia on the Maeander. The "Great Basilica" in Antioch of Pisidia is a rare securely dated 4th century Christian basilica and was the city's cathedral church. The mosaics of the floor credit Optimus, the bishop, with its dedication. Optimus was a contemporary of Basil of Caesarea and corresponded with him c. 377. Optimus was the city's delegate at the First Council of Constantinople in 381, so the 70 m-long single-apsed basilica near the city walls must have been constructed around that time. Pisidia had a number of Christian basilicas constructed in Late Antiquity, particularly in former "bouleuteria", as at Sagalassos, Selge, Pednelissus, while a civic basilica was converted for Christians' use in Cremna.