Tangier Caesarea. Towards the end of the 3rd century, Tangier was the scene of the martyrdoms of St.Marcellus, mentioned in the Roman Martyrology on 30 October, and of St.Cassian, mentioned on 3 December. Under the Portuguese, the diocese of Tangier was a suffragan of Lisbon but, in 1570, it was united with the diocese of Ceuta. Six Bishops of Tangier from this period are known, the firstwho did not reside in his seein 1468. During the era of the French and Spanish protectorates over Morocco, Tangier was the residence of the Prefect Apostolic of Morocco, the mission having been founded on
Tangier province of Mauretania Caesariensis, which included much of North Africa. Later the area was subdivided, with the eastern part keeping the former name and the newer part receiving the name of Mauretania Tingitana. It is not known exactly at what period there may have been an episcopal see at Tangier in ancient times, but in the Middle Ages Tangier was used as a titular see (i.e., an honorific fiction for the appointment of curial and auxiliary bishops), placing it in Mauretania Tingitana. For the historical reasons given above, one official list of the Roman Curia places the see in Mauretania