Alfonso X 'the Wise' (1221-1284):
Biography 1, biography 2 and biography 3.
Cantigas de Santa Maria: music 1 and music 2.
Book of Chess, Dice and Board Games by Alfonso X 'the Wise': facsimile edition.
Alfonso 'the Wise' and his World.
Alfonso X the Wise. The king who launched the Copernican Revolution.