Louis III, 1403–34, king of Naples (1417–34; rival claimant to Joanna II ), duke of Anjou, count of Provence, son and successor of Louis II. He invaded Naples in 1420. Queen Joanna called in the aid of Alfonso V of Aragón and Sicily and adopted him as heir (1421), but Alfonso's domineering attitude caused her (1423) to adopt Louis instead. Louis had gained control of most of the kingdom when he died. Joanna made his brother René heir.
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