Juan Manuel, Prince of Villena
Amongst the nobles that took part in the action were a majority of the nobles from the previous civil strife from both sides. These included Diego Lopez V de Haro, the infante John of Castile, Juan Núñez II de Lara, Alonso Pérez de Guzmán, Fernán Ruiz de Saldaña, Juan Manuel, Prince of Villena and many other magnates from Castile. The Castilian forces were made up of the militias of the towns of Salamanca, Segovia, Seville, and many other cities. King Denis of Portugal also sent 700 knights under Martín Gil de Sousa, Alférez of the king of Portugal. Furthermore, a great deal of knights from the orders of Santiago Calatrava were also present. Pope Clement V granted King Ferdinand IV a tenth of all taxes and rents collected by the church for a period of three years. This edict was passed by papal bull on 28 April 1309 from the city of Avignon.