Pope Martin V freed Cologne Charterhouse of episcopal jurisdiction in 1425, so that from then on it answered directly to the popes.
The next eight years contain no record of his activities, but he was in Rome by October 1418, at which time he entered the papal chapel as a singer, at that time under Pope Martin V; he stayed there until 1421.
Under Urban V (1363) the list contained seven cases; under Gregory XI (1372) nine; under Martin V (1420) ten; under Julius II (1511) twelve: under Paul III (1536) seventeen; under Gregory XIII in 1577 twenty, and under the same pontiff in 1583 twenty-one; under Paul V (1606 and 1619) twenty; and the same number in the final shape given to it by Urban VIII.
In 1435 he married to Margherita Gonzaga and was renowned as legitimate son by Pope Martin V.
From Venice he then travelled to Rome, where he was received by Pope Martin V, and from there he continued to Barcelona, where he negotiated the marriage of his brother Edward with Eleanor of Aragon as well as his own future marriage with Isabella of Urgell, before finally returning to Portugal.
The marriage was arranged as part of a series of diplomatic gestures between Cleofa's uncle Pope Martin V and the Byzantine emperor.
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The Council of Constance (1414–1418) successfully ended the Schism by deposing two Popes (John XXIII and Benedict XIII) – the third Pope abdicated – and electing a successor in Martin V.
Guidantonio (1403–1443) was appointed ruler of the Duchy of Spoleto by Pope Martin V (1419) and carried on war against Braccio da Montone with varying fortune.
The image is based on the Renaissance sculpture by Donatello of a lion called the Marzocco which was originally commissioned for Pope Martin V and moved in 1812 to the Piazza della Signoria in Florence where it became a symbol of Florentine liberties.
Belforte Spinelli (1432), who while yet a layman assisted at the Council of Constance, under Pope Martin V was sent on important missions, and later renounced the world and retired to Venice, leaving his rich library to the Collegio Spinelli of Padua;