Alfonso X, the Wise, King of Castile, León and Galicia, 1221-1284 was politically an unfortunate monarch in the time of the Spanish Reconquista (reoccupation of the area of the Moors), but very interested and engaged in art, science, literature and law. At the end of his life he edited the “Book of Games” (Libro de los juegos) which mostly deals with chess and chess problems and some improvements how to move pieces on the board. So he first mentioned a two-square-step of the pawn on his first move and the promotion into a Vizier (the later Queen) on the 8th row.