The Libro de los Juegos, ("Book of games"), or Libro de ajedrez, dados y tablas, ("Book of chess, dice and tables") was commissioned
by Alfonso X, king of León and Castile, during the 13th century between 1251 and 1283 AD.
It consists of 98 pages, with 150 color illustrations. The games
covered include chess (including the earliest known European chess problems), dice, and tables (the family of games that includes backgammon). It contains the earliest known description of some of these games, including many games imported from the Arab kingdoms.
It is one of the most important documents for researching the history of board games. The only known original is held in the library of the monastery of San Lorenzo del Escorial near Madrid in Spain. It is bound in sheepskin and is 16.5 inches high and 11.7 inches wide (42 × 30 cm).
A 1334 copy is held in the library of the Historical Academy of Madrid.
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