Alfonso X (also occasionally known as Alphonso, Alphonse, or Alfons, called the Wise (Spanish: el Sabio), was the King of Castile, León and Galicia from 30 May 1252 until his death in 1284. During the imperial election of 1257, a dissident faction chose him to be King of the Romans (Latin: Rex Romanorum; German: Römisch-deutscher König) on 1 April. He renounced his imperial claim in 1275, and in creating an alliance with England in 1254, his claim on Gascony as well.
