Innocent V, born Pierre de Tarentaise, was a Dominican theologian who served as the head of the Catholic Church from January to June 1276. Born around 1225 in the Tarentaise region, he rose through the ranks of the Order of Preachers, serving as a professor at the University of Paris and as the Provincial of the French Province. After being appointed cardinal-bishop of Ostia by Pope Gregory X, he was elected pope in the first conclave ever held under the new rules established at the Council of Lyons. His brief papacy was marked by efforts to mediate peace between Genoa and the King of Sicily.