Portuguese Guinea
Until September 4, 1940 the diocese covered not only the Cape Verde islands, but also Portuguese Guinea on the African mainland. Portuguese Guinea became a Mission "sui iuris", the later Roman Catholic Diocese of Bissau. Since November 2003 the (northern) Barlavento Islands form the separate Roman Catholic Diocese of Mindelo, and the Diocese of Santiago de Cabo Verde only covers the (southern) Sotavento Islands.