In the Byzantine period, many of Petra’s tombs were modified into churches. Three new churches were also constructed in the city center: the Petra Church, the Blue Church, and the Ridge Church. The Petra Church was built in the late 5th century. It contains exquisite mosaics depicting personifications of nature and animals, which represent God’s domain. The Blue Church is so called for its blue Egyptian granite columns adorned with Nabataean horned capitals.
The three main churches are north of the Colonnade Street in the center of Petra. Among the tombs modified into churches are the Urn Tomb east of Colonnade Street and the Christian Tombs north of the city.