High Quality Content by WIKIPEDIA articles! The Battle of Alfarrobeira (Portuguese pronunciation: ) took place on 20 May 1449. It was a confrontation between the forces commanded by King Afonso V of Portugal and his uncle Afonso, Duke of Braganza, against the army of the rebellious Pedro, Duke of Coimbra. The place was Alverca do Ribatejo, near Lisbon, at the margins of the creek of Alfarrobeira. The result was the clear defeat and death of the Duke of Coimbra and the establishment of the Braganzas as the most powerful House of Portugal.