"Why Learn Spanish in Castile and Leon? First and foremost, it's no exaggeration to say that Castile and Leon is the home of the language: 'Spanish', after all, is known as 'Castellano' because it comes from Castile, where it developed in the 10th century. As such, one of the very purest of all the many different global variations and dialects of modern Spanish is spoken in Castile and Leon. "