Question: who was alfonso x el sabio?
Answer: Alfonso X (also known as the Wise, Spanish: el Sabio; 23 November 1221 – 4 April 1284) was the king of Castile, León and Galicia from 30 May 1252 until his death in 1284. During the election of 1257, a dissident faction chose him to be king of Germany on 1 April.