Chess in Spain refers to Spain's contribution to the history of chess, from its integration around the 10th century to the present day. The Spanish received Shatranj, one of the predecessors of chess, from the Arabs during the Muslim conquest of the Iberian Peninsula between the 7th and 15th centuries. As chess spread to the rest of Europe, Spain contributed to the chess literature of the period, culminating with the Libro de los juegos (1283), commissioned by Alfonso X in the 13th century. Also of Spanish origin are the first archaeological pieces of evidence of the game on European soil: the Ager pieces, a set of medieval chess pieces dating from the 11th century, of abstract design and made of crystal, that belonged to Arnau Mir de Tost.