The Nabataeans worshipped the Arab gods and goddesses of the pre-Islamic times as well as a few of their deified kings. One, Obodas I, was deified after his death. Dushara was the main male god accompanied by his female trinity: Al-‘Uzzá, Allat and Manāt. Many statues carved in the rock depict these gods and goddesses.
The Monastery, Petra's largest monument, dates from the 1st century BC. It was dedicated to Obodas I and is believed to be the symposium of Obodas the god. This information is inscribed on the ruins of the Monastery (the name is the translation of the Arabic "Ad Deir").
Christianity found its way to Petra in the 4th century AD, nearly 500 years after the establishment of Petra as a trade center. Athanasiusmentions a bishop of Petra (Anhioch. 10) named Asterius. At least one of the tombs (the "tomb with the urn"?) was used as a church. An inscription in red paint records its consecration "in the time of the most holy bishop Jason" (447). After the Islamic conquest of 629–632 Christianity in Petra, as of most of Arabia, gave way to Islam. During the First Crusade Petra was occupied by Baldwin I of the Kingdom of Jerusalem and formed the second fief of the barony of Al Karak (in the lordship of Oultrejordain) with the title Château de la Valée de Moyse or Sela. It remained in the hands of the Franks until 1189. It is still a titular see of the Catholic Church.
Two Crusader-period castles are known in and around Petra. The first is al-Wu'ayra and is situated just north of Wadi Musa. It can be viewed from the road to "Little Petra". It is the castle of Valle Moise which was seized by a band of Turks with the help of local Muslims and only recovered by the Crusaders after they began to destroy the olive trees of Wadi Musa. The potential loss of livelihood led the locals to negotiate surrender. The second is on the summit of el-Habis in the heart of Petra and can be accessed via a flight of steps that begins near the tomb
