There were ten incumbents in 1815–1863, representing the British protecting power to the United States of the Ionian Islands as a federal Septinsular Republic of seven formerly Venetian (see Ionian Islands under Venetian rule) Ionian islands (Corfu, Cephalonia, Zante, Santa Maura, Ithaca, Cerigo and Paxos), officially a joint protectorate of the Allied Christian Powers, de facto a UK amical protectorate, as established under the 1815 Treaty of Paris. The office ceased when the islands were integrated in independent Greece in 1864.