 The territory was originally part of the Vicariate Apostolic of the Gallas, but it was separated into an apostolic prefecture by Pope Pius IX on 21 January 1875.On 25 April 1888, Pope Leo XIII made the Apostolic Vicarate of Aden, located in Yemen.On the 28 June 1889, the name was changed to the Vicariate Apostolic of Arabia, responsible for the countries of the Arabian Peninsula and surrounding region