Alfonso X of Castile Sheet Music
- Born: November 1221
- Died: 4th April 1284
- Birthplace: Toledo, Spain
Alfonso X (also occasionally Alphonso X, Alphonse X, or Alfons X, 23), called the Wise (Spanish: el Sabio), was the King of Castile, León and Galicia from 30 May 1252 until his death. Alfonso X commissioned or co-authored numerous works of music during his reign. These works included Cantigas d'escarnio e maldicer and the vast compilation Cantigas de Santa Maria ("Songs to the Virgin Mary"), which was written in Galician-Portuguese and figures among the most important of his works.