Manuel I of Portugal
Manuel's mother was the granddaughter of King John I of Portugal, whereas his father was the second surviving son of King Edward of Portugal and the younger brother of King Afonso V of Portugal. In 1495, Manuel succeeded his first cousin, King John II of Portugal, who was also his brother-in-law, as husband to Manuel's sister, Eleanor of Viseu.
List of movements that dispute the legitimacy of a reigning monarch
In February 1828, Miguel returned to Portugal to take the oath of allegiance to the Charter and assume the regency. The Cortes of 1828 proclaiming him king as Miguel I of Portugal and he reigned from 1828 to 1834.