Conquest of Murcia (1265–66) participant Crown of Aragon
A conquest of Murcia took place in 1265–66 when James I of Aragon conquered the Muslim-held Taifa of Murcia on behalf of his ally Alfonso X of Castile.Previously, Murcia was a semi-independent vassal of Castile, but renounced its allegiance during the Mudéjar revolt of 1264–1266. Aragon entered the war on Castile's side after Castile's Queen Violant—who was James' daughter—wrote a letter asking for her father's help. 
After initial negotiations with his nobles, James marched from Valencia at the end of October 1265. Subsequently, Aragonese troops took multiple Murcian towns and defeated a reinforcement column sent by the Emirate of Granada. The siege of the city of Murcia started in January 1266, ending in its surrender on 31 January and James' entrance to the city on 3 February. 
After the conquest, Murcia was returned to Castile and lost its semi-independent status. Subsequently, its Muslim population was moved to suburbs as Castile brought Christian settlers to populate the region.Aragonese offensive
Preparation
Initially the task to suppress the revolt passed to Alfonso's brother Manuel and Grand Master Paio Peres Correia of the Order of Santiago. Concerned that Castile was fighting on three fronts, Alfonso X asked his wife, Queen Violant to request help from her father, James I of Aragon. James I agreed and summoned his parliaments to support the war. The Catalan Courts agreed to raise taxes for the campaign in July 1264, but the parliament for his other dominion, Aragonese Corts initially rejected the campaign when they met in November. James I spent the next following months trying to convince the Aragonese lords. In May 1265, the Archbishop of Tarragon and the Bishop of Valencia began preaching for crusades. Pope Clement IV allowed James to collect tithe from his dominions for up to three years to fund the crusade. Infante Peter (future Peter III of Aragon) carried out initial raids against the rebels in late summer of 1265.