Hierapolis. Turkey. View of the central octagonal room of the Martyrium of Saint Philip the Apostle in the ancient city. The structure was built in the 5th century AD on the site Saint Philip was apparently crucified martyred in 80 AD after the saint had founded the first Christian community in the city. It consists of a large central octagonal room with eight chamber rooms opening into it. The rooms will have been used as chapels and residences for visiting pilgrims. The building supposedly once contained the bodies of the saint and his sons.