サンチョ4世
Already in his infancy the question of his marriage was raised, being the desire of Sancho IV to choose a princess from Kingdoms of France or Portugal. In the agreement signed by Sancho IV and King Denis of Portugal in September 1291, was established the betrothal between Ferdinand and the "Infanta" Constance, daughter of the Portuguese sovereign. Nevertheless, in spite of the commitment contracted with the Portuguese monarch, in 1294, Sancho IV thought about the possibility of marrying his son with Margaret or Blanche, daughters of King Philip IV of France. The death of Sancho IV a year later put an end to the negotiations with the French court.