Already famous in academic circles, he was invited to court and nominated Royal Astronomer and Historian by King John II of Portugal, a position which he held until the early reign of Manuel I.
He was son of the Duke of Liñares and his mother was descendant of infante Jorge de Lancastre, a natural son of King John II of Portugal.
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Eleanor of Viseu (1458–1525), aka Eleanor of Viseu or Eleanor of Lancaster, daughter of Infante Ferdinand, Duke of Viseu and Infanta Beatrice, Duchess of Viseu, wife of John II of Portugal