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Peter married María, a daughter of King James II of Aragon. Their only child, Blanche, was born after Peter's death. Although she was betrothed to King Peter I of Portugal, the marriage never took place.
In 1313, an agreement [es] reached at Palazuelos [es] divided the regency of the young Alfonso XI between Peter, John and María, with the men being described as tutores. This was confirmed by a cortes at Burgos in 1315. Throughout the disputes over the regency in the years 1312–15 that often devolved into open conflict, Peter supported his mother and was often at odds with his uncle.[1]
In 1316, Peter led a military expedition to the frontier of the Kingdom of Granada. According to Christian sources, he won a great victory in the field, but unsuccessfully besieged two castles. Muslims sources mention no victory. In 1317, he again invaded Granada, relieving the siege of Gibraltar and capturing the castle of Bélmez de la Moraleda. In 1319, having received papal approval for a crusade against Granada, Peter and John jointly led an expedition to besiege the fortress of Tíscar. They separated their armies and were ambushed by a Muslim relief force. Both Peter and John were killed in the ensuing rout, known as the Disaster of the Vega de Granada.[2]
Agrait, Nicolás (1998). "The Reconquest During the Reign of Alfonso XI". In Donald J. Kagay; Therese M. Vann (eds.). On the Social Origins of Medieval Institutions: Essays in Honor of Joseph F. O'Callaghan. Leiden: Brill.
Pepin, Paulette Lynn (2016). María de Molina, Queen and Regent: Life and Rule in Castile-León, 1259–1321. Lexington Books.