Charles of Viana (vēäˈnä) [key], 1421–61, Spanish prince, heir of Navarre; son of Blanche of Navarre and John (later John II) of Aragón. After his mother's death (1441) he ruled Navarre for his father, but serious differences between the two soon plunged the country into civil war. He was twice imprisoned by his father and died shortly after an uprising in Catalonia had forced John to recognize him as his heir.
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