House of Borgia
Pedro de Atarés died on 21 February 1151 and was buried at the abbey which he had founded. Although he died without leaving any children, members of the House of Borgia invented a genealogy tracing their origins back to this member of the royal house coinciding with the third wedding of Lucrezia Borgia to Alfonso I d'Este, Duke of Ferrara, which was arranged by her father Pope Alexander VI. Nevertheless: