In 1016 boundaries had been drawn between Navarre and Castile; these boundaries made what would now be the Basque Country part of Navarre. This lasted until Guipuzcoa, Alava, and Vizcaya broke away from that kingdom amid a difficult political situation and became integrated into Castile under a treaty in 1200.
In 1016, boundaries were established between Navarre and Castile; these boundaries designated what would now be the Basque Country as part of Navarre. This arrangement lasted until Guipuzcoa, Alava, and Vizcaya separated from that kingdom due to a challenging political climate and integrated into Castile under a treaty in 1200.