Kingdom of León
Until 1833, the independently administered Kingdom of León, situated in the northwest region of the Iberian Peninsula, retained the status of a kingdom, although dynastic union had brought it into the Crown of Castile. The Kingdom of León was founded in 910 A.D. when the Christian princes of Asturias along the northern coast of the peninsula shifted their main seat from Oviedo to the city of León. The Atlantic provinces became the Kingdom of Portugal in 1139.