The new bishop in Scach d'amor and in chess has been a great mystery from the XV century until now, because not only was the power of the Queen greatly introduced, but so was also the position of the church. Pedro Gonzalez de Mendoza was the partisan of Princess (later Queen) Isabella I of Castile and fought for her in the Battle of Zamora and Toro between 1475 and 1476. This warrior churchman had a prominent part in placing Princess Isabella on the throne and served her tirelessly in her efforts to suppress the disorderly nobles of Castile with the money of the church. Cardinal Pedro Gonzalez de Mendoza remains one of the most striking and picturesque figures of the XVcentury, and was equally great as churchman, statesman and warrior. He was considered as “the third king of Spain” and Isabella’s best adviser.