ADRIAN V. (Ottobuono de' Fieschi), pope in 1276, was a Genoese who was created cardinal deacon by his uncle Innocent IV. In 1264 he was sent to England to mediate between Henry III. and his barons. He was elected pope to succeed Innocent V. on July II, 1276, but died at Viterbo on Aug. 18, without having been ordained even to the priesthood.