 Castillian pressure resulted in the bequeathing of Navarre to Castilian Queen Isabella's daughter, Joanna of Castile, and annexing the Basque kingdom to Castile in 1515.The annexation was confirmed after Ferdinand took an oath to respect Navarre's laws and institutions, the "pactum subjectionis".On 11June 1515 the "Cortes" of Burgos met.