The Battle of Llantada or Llantadilla was a border skirmish fought on 19 July 1068 on the banks of the Pisuerga near the frontier between León and Castile. There Sancho II of Castile defeated his brother Alfonso VI of León. Though Rodrigo Díaz de Vivar is usually associated with this battle, the evidence of his presence there is rather late and his influence in Castile at that early stage of his career too slight to make plausible the tradition that he was Sancho's alférez.