 An understanding of Magdalena with Ferdinand, by which the Navarrese monarchs' first-born Anne would marry John, Prince of Asturias, or any grandson by Ferdinand and Isabella, led to the coronation in Pamplona of Catherine and John in 1494.However, the Count of Lerin would not accept the agreement, prompting a revolt.The crown was now resolute to crush him and other rebellious earls once and for all, but needed to secure the control of all fortresses in the kingdom for the purpose.