On 14 December 1412, he was made Cardinal-priest of Sant'Angelo in Pescheria by the Avignon Antipope Benedict XIII.

[1][2] On 5 June 1413, Pedro da Fonseca was appointed Administrator of Astorga and on 6 Jun 1419, he was transferred to the Diocese of Sigüenza where he served as Administrator until his resignation on 7 Jun 1419.

The kingdoms of Naples and Sicily, in Italy were then ruled by the Aragonese King, Alfonso V of Aragon.

On 22 August 1422, during the visit of the Pope to the Aragonese king at Vicovaro, he died after falling down the stairs at the monastery of Saint Cosimato.

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