The ruins of the Byzantine Church are adjacent to and south of the Hieropolis Archaeology Museum on the west side of the ruin. The church is impressive in size, but unfortunately little restoration has been done. A few walls and arcades are visible, and there is an interpretive sign near the ruins. Christianity started to be openly practiced in this area in the 4th century. Byzantine emperor Justinian raised the bishop of Hieropolis to the rank of metropolitan in 531, and parts of the Roman baths were transformed to a Christian basilica. The city flourished during the Byzantine period and was an important center for Christians attracted by the healing powers of the thermal springs. Pilgrims also came to visit the alleged site of the martyrdom of St. Philip at the top of the hill. According to legend, Phillip was crucified upside-down; others say he was hung upside down by his ankles from a tree. Artifacts in the Archaeological Museum next door provides some insight into life in Hieropolis in the Byzantine period.

Ancient city of Hierapolis is huge and since most people only assign a single day to Pamukkale (some even do a day trip), it's pretty difficult to walk so much to cover all the sites in Hierapolis. If you have been to ancient Greeko Roman cities in different parts of the world and you are short on time then you may skip this church. Instead, spend more time at travertines and thermal pools which are more unique experiences. Also, check out the Amphitheatre.