Christianity found its way to Petra in the 4th century AD, nearly 500 years after the establishment of Petra as a trade centre. Athanasius mentions 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.