 The word "pontifex" and its derivative "pontiff" later became terms used for Catholic bishops, including the Bishop of Rome, and the title of "Pontifex Maximus" was applied within the Catholic Church to the Pope as its chief bishop and appears on buildings, monuments and coins of popes of Renaissance and modern times.The official list of titles of the Pope given in the Annuario Pontificio includes "Supreme Pontiff" (in Latin, "Summus Pontifex") as the fourth title, the first being "Bishop of Rome".The etymology of "pontifex" is uncertain, but the word has been used since Roman times.