This complex comprises the Petra Church, Blue Chapel and Ridge Church. The Petra Church as seen here in the floor plan is a tripartite basilica, measuring around 26m E-W 7 15m N-S, with three inscribed apses and three corresponding entrances.It was probably built in the last half of the fifth century AD. The church's preserved mosaic floor has beautiful illustrations. Many of these images lie inside circular medallions and depict animals, birds, humans, vegetal produce, and vessels, as well as personifications of the four seasons, the ocean, earth and wisdom. The Blue Chapel was named for the four blue Egyptian granite columns that were presumably moved there from a nearby Nabataean monument. Inside the chapel lies a base for a bishop's throne in the apse, a marble pulpit and marble chancel posts and screens. The Ridge Cutch (Jumay'an Hill) is a simple building made up of two wings separated from the nave by five columns on each side. It has a large cistern under the nave that was fed by rain from the roof. This complex of three churches was built over earlier Nabataean buildings and tombs, which remained in use throughout the Roman period before Christianity became dominant in Petra in the 5th century, at which time some buildings and tombs were converted to churches. The finely-carved capitals 0أ the columns in the Blue Chapel, for example, are Nabataean, suggesting that these may have been recovered from an earlier temple