In 1432 the University of Salamanca and King John II of Castile sent him as their representative to the Council of Basle, where he was one of the ablest defenders of the superiority of the council over the pope.
In 1432, the University of Salamanca and King John II of Castile appointed him as their delegate to the Council of Basle, where he was one of the most skilled advocates for the council's authority over the pope.