Kings of Spain (Castile, Leon, Aragon, Sicily, etc.):
1516 - 1538: John III 'the Fortunate" (House of Trastámara)[1]
1538 - 1550: Charles I "the Blond" (House of Trastámara)[2]
1550 - 1552: Charles II "the Sickly" (House of Trastámara) [3]
1552 - 1565: Henry V "the Red Viper" (House of...