The Crown of Castile (, , Leonese: Corona de Castiella, , ) was a medieval and modern state in the Iberian Peninsula that formed in 1230 as a result of the third and definitive union of the crowns and parliaments of the kingdoms of Castile and León upon the accession of the then King Ferdinand III of Castile to the vacant Leonese throne. It continued to exist as a separate entity after the personal union of the crowns of Castile and Aragon with the marriage of the Catholic Monarchs in 1469 and wasn't formally abolished until the unification policies of Philip V of Spain in the early 18th century. During its existence, the Spanish colonies in the Americas and the Philippines were also considered part of the Crown of Castile.
Two kingdoms: León and Castile
The Kingdom of León arose out of the Kingdom of Asturias. The Kingdom of Castile appeared initially as a county of the Kingdom of León. From the second half of the 10th century to the first half of the 11th century it changed hands between León and the Kingdom of Navarre. In the 11th century it became a kingdom in its own right.
The two kingdoms had been united twice previously: