the Libro de los juegos

One of the oldest books written about board games is a book called Libro de los Juegos, or Libro de Axedrez, Dados e Tablas, The Book of Games, or The Book of Chess, Dice and Tables, commissioned by King Alfonso X of Castile, Galicia and León in Toledo, Spain, in 1283.

The original manuscript of the book from 1283 is kept in the Real Biblioteca del Monasterio de San Lorenzo de El Escorial (Escorial Monastery Library) in Madrid, Spain. It is an illuminated manuscript with beautiful paintings of games and players. Another manuscript copy, made in 1334, is kept at the Real Academia de la Historia (Royal Academy of History Library) in Madrid, Spain.
The book consists of ninety-seven leaves of parchment, many with colour illustrations, and contains 150 miniatures. The text is a treatise that addresses the playing of three games: a game of skill, or chess; a game of chance, or dice; and a third game, backgammon, which combines elements of both skill and chance. The book contains the earliest known description of these games.

The Libro de juegos contains an extensive collection of writings on chess, with over 100 chess problems and variants. Among its more notable entries is a depiction of what Alfonso calls the ajedrex de los quatro tiempos ("chess of the four seasons"). This game is a chess variant for four players, described as representing a conflict between the four elements and the four humours. The chessmen are marked correspondingly in green, red, black, and white, and pieces are moved according to the roll of dice.

More information here > https://en.wikipedia.org/wiki/Libro_de_los_juegos