Charles III (Charles of Durazzo), 1345-86, king of Naples (1381-86) and, as Charles II, of Hungary (1385-86); great-grandson of Charles II of Naples. Adopted as a child by Joanna I of Naples, he later lived at the court of Louis I of Hungary. In 1380, Pope Urban VI summoned Charles to dethrone Joanna because of her support of the antipope, Clement IV; Joanna repudiated Charles as her heir in favor of Louis of Anjou (see Louis I, king of Naples). Charles conquered Naples, imprisoned Joanna, and was crowned (1381) by the pope. Joanna died by his order. Charles repulsed attacks on Naples by Louis of Anjou. In 1385, elected king of Hungary over Sigismund, Charles was crowned but was soon assassinated. He was succeeded in Naples by his son, Lancelot, and in Hungary by Sigismund.