HENRY IV. king of Castile, "the Impotent," was the son of John II. of Castile and Leon and of Mary, daughter of Ferdinand I. of Aragon and Sicily. Born at Valladolid on Jan. 6, 1425, he was weak and vacillating in character, and his reign was marked by incidents of the most ignominious kind. He divorced (1453) his wife Blanche of Navarre on the ground of mutual impotence, married Joan of Portugal in 1468, repudiated the daughter that she bore him, then claimed her for his own. Deposed in favour of his brother Alphonso in 1468, he was re stored at the latter's death in the same year. He died at Madrid on Dec. 12,