GREGORY VIII. (Alberto de Mora), pope from Oct. 21 to Dec. 17, 1187, a native of Benevento and Praemonstratensian monk, successively abbot of St. Martin at Laon, cardinal-deacon of San' Adriano al foro, cardinal-priest of San Lorenzo in Lucina, and chancellor of the Roman Church, was elected to succeed Urban III. He died at Pisa while engaged in making peace between the Iii. He died at Pisa while engaged in making peace between the Pisans and Genoese in order to secure their help in the new crusade which he was urging for the recovery of Jerusalem.
His letters are in Migne, Patrol. Lat., vol. 202. Consult J. M. Watterich, Pontif. Roman. vitae, vol. 2 (Leipzig, 1862), Jaffe, Regesta pontif. Roman.; J. Langen, Geschichte der romischen Kirche von Gregor VII. bis Innocenz III. (Bonn, 1893) ; P. Nadig, Gregors VIII. 57tdgiges Pontifikat (Basle, 189o).