1.nounThe three-tiered tiara formerly worn by Popes."1997: The last in this series of deaths was that of Pope Eugenius’s successor Anastasius IV, who was succeeded by a man of a very different calibre: Adrian (or Hadrian) IV, the only Englishman ever to wear the Triple Crown. — John Julius Norwich, A Short History of Byzantium (Penguin 1998, p. 281)"