Alfonso the Wise promised to give his daughter and son-in-law the Algarve upon their son's seventh birthday.

In a strategic move to strengthen the alliance between Spain and Portugal, Alfonso the Wise, the King of Spain, gave his daughter Beatrice of Castile to be married to the Portuguese king, Afonso III of Portugal. This marital union not only solidified the political ties between the two kingdoms but also established a clear succession plan. Alfonso the Wise promised to cede the Algarve, a region in southern Portugal, to their firstborn son on his seventh birthday, ensuring that their offspring would have a legitimate claim to the territory. This agreement showcased the diplomatic finesse of Alfonso the Wise, who sought to create a lasting partnership and secure his kingdom's interests. The union between Beatrice and Afonso III would have long-lasting repercussions, shaping the future of both Spain and Portugal. #AlfonsoTheWise #BeatriceOfCastile #AfonsoIII #Spain #Portugal #Algarve #Alliance #Diplomacy