On 21 December 1507, Charles was betrothed to 11-year-old , the daughter of King and younger sister to the future King , who was to take the throne in two years.
He managed to overcome the resistance of the Aragonese Cortes and Catalan Corts, and he was recognized as king of Aragon and count of Barcelona jointly with his mother, while his mother was kept confined and could only rule in name.
He won the crown on 28 June 1519.
However, the engagement was called off in 1513, on the advice of , and Mary was instead married to King in 1514.
The keeping of this day we justify, By scripture, reason, and antiquity.
He arrived at the of in 1557.