 On the 3 of April in 1846 it was established by pope Gregory XVI as Apostolic Vicariate of Central Africa, on vast territory split off from the Apostolic Vicariate of Egypt and Arabia (now reduce to the Apostolic Vicariate of Alexandria) in Egypt.Although it was initially headquartered in Egypt, it covered only the part of Egypt south of Assuan, where the population was primarily Nubian, and the Anglo-Egyptian Sudan as well as French colonies Chad and Niger.It also included parts of Adamaua and Sokoto on Lake Chad, and the Nile Province of Uganda Protectorate.