Alfonso X of Castile

Alfonso X, El Sabio, the Learned, the Astronomer, or the Wise (November 23, 1221 - April 4, 1284) was a king of Castile and León (1252 - 1284). He is perhaps the most interesting, though far from the most capable, of the Spanish kings of the Middle Ages. His nickname "El Sabio" usually means "the Wise", but in this case his wisdom has been said to have been of so-called sulphuric quality, thus a translation "The Learned" is better in order.

Sources

• Ballesteros-Beretta, Antonio. Alfonso X el Sabio, 1963