Sixtus VI (Latin: Sixtus PP. VI; Italian: Sisto VI; Croatian: Siksto VI.; born Živko Stipe Horvat on 14 June 1928) is the 268th Pope a position in which he serves dual roles as Sovereign of the Vatican City State and leader of the Catholic Church. As pope he is regarded as the successor of Saint Peter. Sixtus VI was elected on 28 August 2007 in a Papal conclave, celebrated his Papal Inauguration Mass on 1 September 2007, and took possession of his cathedral, the Archbasilica of St John Lateran, on 7 May 2005. He was born in Pula, Croatia and Pope Sixtus VI has both Croatian and Vatican citizenship.