Original: It was called County of Castile and was held in vassalage from the Kingdom of LeÃ n. Its name comes from the host of castles constructed in the region. It was one of the kingdoms that founded the Crown of Castile, and the Kingdom of Spain.
Simplified: It began in the 9th century: it was called County of Castile and was a vassalage depending from the Kingdom of LeÃ n/O. It was one of the kingdoms that existed before the Kingdom of Spain.