Toledo Cathedral
Almost nothing is known about his early years, but a document dated 1537 affirms that he had been in the service of the Toledo Cathedral for 62 years. This suggests that he entered the cathedral in 1475 as a choirboy. In June 1490 he became master of the choirboys ("claustrero"), replacing Juan de Triana in the post. In 1495 he succeeded in obtaining a prebend as a singer in open contest; according to the rules, the winner would be the "most accomplished and fluent singer" among the contestants, and highly trained in polyphonic composition.