Alphonso IV of Portugal

In 1325, he succeeded his father, Diniz, whose death he had hastened by his intrigues and rebellions. Hostilities with the Castilians and with the Moors occupied many years of his reign, during which he gained some successes. He later made peace with Alfonso XI of Castile and Portuguese troops particaipated in the victory of Rio Salado over the Marinids in October 1340. By consenting to the barbarous murder of Inez de Castro, who was secretly espoused to his son Peter, Afonso has fixed an indelible stain on his character. Enraged at this barbarous act, Peter put himself at the head of an army and devastated the whole of the country between the Douro and the Minho before he was reconciled to his father. Afonso died almost immediately after, on May 12, 1357.

Initial text from 1911 encyclopedia -- Please update as needed