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.
Carlos I of Portugal
Carlos became king on 19 October 1889. After the 1890 British Ultimatum, a series of colonial treaties were signed with the United Kingdom of Great Britain and Ireland. One signed in August 1890 defined African colonial borders along the Zambezi and Congo rivers, whereas another signed on 14 October 1899 confirmed colonial treaties of the 17th century. These treaties stabilised the political balance in Africa, ending Portuguese claims of sovereignty on the Pink Map, a geographical conception of how Portuguese colonies would appear on a map if the territory between the coastal colonies of Angola and Mozambique could be connected with territory in central Africa. These central African territories were taken over by Great Britain, however, a concession that was viewed as humiliating in Portugal. The agreements were thus looked upon as unpopular in Portugal and were felt to be disadvantageous to the country.