Eugene IV

Pope Eugene IV, born Gabriele Condulmer, was head of the Catholic Church and ruler of the Papal States from 3 March 1431 to his death. Condulmer was a Venetian, and a nephew of Pope Gregory XII. In 1431, he was elected pope. His tenure was marked by conflict first with the Colonnas, relatives of his predecessor Martin V, and later with the Conciliar movement. In 1434, due to a complaint by Fernando Calvetos, bishop of the Canary Islands, Eugene IV issued the bull "Creator Omnium", rescinding any recognition of Portugal's right to conquer those islands, still pagan. He excommunicated anyone who enslaved newly converted Christians, the penalty to stand until the captives were restored to their liberty and possessions. In 1443 Eugene decided to take a neutral position on territorial disputes between Portugal and Castile regarding rights claimed along the coast of Africa.