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.
History of Portugal (1834–1910)
Manuel II would reign for only a short time, as republican forces continued to attack the monarchy and its institutions, even though the young king was considered a popular monarch. His unexpected accession to the throne (18 years of age), was marked by the brutal murder of his father and brother, yet his reign was pragmatic and respected the principles of the constitutional monarchy. Despite threats from the ultra-militant members of the Republican Party and the Carbonária, King Manuel courageously took responsibility for upholding the institutions of the State and the rule of law.