He and other knights rose against the Master Garci López de Padilla, who was discredited because of his failure in his fight against the Taifa of Jaén, and his poor performance in an expedition against the Muslims of the Emirate of Granada, where he was supposed to have fled from the battlefield.
[2][3] In 1325 Alfonso XI of Castile granted the wishes of the rebel knights and friars, who came to the court at Valladolid to indict the master on four counts.
The first was dereliction of the strongholds that the master Garci had left without supplies and that had been lost, including those of Alcaudete, Locubín, Susaña, Chist and Mathet.
[6] But, with the backing of the Castilian king and most of the knights of the order for Juan Núñez de Prado, who held the Calatrava villas and castles, García López de Padilla resigned from the mastership in 1329 in exchange for continuing to have the service of ten knights and lifetime enjoyment of a few villas and castles held by the order in the kingdoms of Aragon and Valencia, with their income, and the Zorita and El Collado sections.
[8] During the reign of Peter of Castile (r. 1350–1369), the son and successor of Alfonso XI, Juan Núñez de Prado opposed the king's policies.