Infanta Joan of Portugal was the second child of Afonso, but after the early death of her older brother John she was declared heiress to the throne in spite of being female. She was given the title of "Princess of Portugal," a title was reserved for the heir apparent. Other children of the king were styled, "Infante (Prince)" or "Infanta (Princess)". Even though she lost it after the birth of her younger brother, the future John II of Portugal, among the people she continued to be known as Princess Joan.