(Baldassare Costa)
Antipope 1410–15. In an attempt to end the Great Schism he was elected pope by a council of cardinals in Bologna, but was deposed by the Council of Constance 1415, together with the popes of Avignon and Rome. His papacy is not recognized by the church.
(Angelo Giuseppe Roncalli) (1881-1963) Pope from 1958. He improved relations with the USSR in line with his encyclical Pacem in Terris/Peace on Earth 1963, established Roman Catholic hierarchies in newly emergent states, and summoned the Second Vatican Council, which reformed church liturgy and backed the ecumenical movement