Template:Wp-Sancho Alfónsez

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Sancho Alfónsez (or Adefónsez) (ca. 1093 – 29 May 1108) was the only son of King Alfonso VI of Castile and León; his mother was the Moorish princess Zaida. Alfonso's heir from May 1107, he eventually co-ruled from Toledo. He predeceased his father, being killed while trying to escape the field of the Battle of Uclés. His death, on his first recorded military expedition, precipitated a succession crisis that ended with the accession of his elder half-sister Urraca and her husband, Alfonso the Battler, already King of Navarre and Aragon, to the throne of Kingdom of Castile-León.