Catherine reigned together with her husband John III. After his death, she reigned alone for eight months until her own death. During their reign, Navarre was defeated by Ferdinand II of Aragon in 1512, resulting in the loss of all its territory south of the Pyrenees, including the royal capital of Pamplona. Ferdinand, the son of John II and his second wife and thus the half-brother of Catherine's grandmother Eleanor, was then crowned King of Navarre, and that branch of the title descended through the Aragonese and Spanish monarchs. Catherine and John III were left with Lower Navarre, that small fraction of the kingdom's former territory that is on the north side of the Pyrenees, which was united with other lands in France that were under their control.