[1] During the Western Schism, he aligned with the Antipope Benedict XIII and the revived line of Avignon popes, and continued that support until the Council of Constance, when Ferdinand I of Aragon withdrew his support for Avignon, at which point Alfons tried unsuccessfully to convince Benedict to voluntarily renounce his claim to the papacy.
[2] Alfons began his ecclesiastical career as the rector of the church of Sant Mateu (Saint Matthew) in Tortosa.
He next served the Benedict XIII as his ambassador to the Kingdom of Castile, and later became rector of the Church of Santa Maria del Pi in Barcelona, from which position he was appointed a deputy to the Catalan Courts held in Barcelona, the Catalan parliament.
His activities in the role of ecclesiastical deputy to the Generalitat required that he take part in the parliamentary discussion of the succession after Martin's death in 1410.
In both of these parliamentary assemblies as well as in the Corts of Sant Cugat-Tortosa (1419), he tried, with little success, to influence the new Trastámara king to continue the policies of the earlier line of Aragonese monarchs of the House of Barcelona.