Antipope Felix V
Alexander's support to the Council of Florence (he even personally attended in the sessions at Basel in 1433, 1434 and 1442), brought him in December 1439 the title of Patriarch of Aquileia, while he kept the dignity of Bishop of Trento. Antipope Felix V didn't have sufficient support to implement this decision, while his opponent, Pope Eugene IV appointed to this office another candidate who actually won the power, Ludovico Trevisan. Soon after, the Council and Felix V (in order to bring the Jagiellonians and Habsburgs to their side), granted Alexander the title of Cardinal with the diocese of St. Lawrence at Damascus (12 October 1440), the Swiss Bishopric of Chur (March 1442) and finally the rectory of St. Stephen's Cathedral in Vienna. From all this appointments, Alexander was able to really take possession only of the St. Stephen's rectory.