Prefecture Apostolic of the British Solomons 27 July 1987. Apostolic Vicariate of the South Solomons 1 July 1912. Diocese of Honiara 15 November 1966. The Archdiocese of Honiara was set up 22 December 1978. The area under the care of the Archdiocese includes the four Provinces of Guadalcanal, Maker Ulawa, Temotu and Central Islands Province as well as the area governed by Honiara City Council.