High Quality Content by WIKIPEDIA articles! Louis III (25 September 1403 12 November 1434) was titular King of Naples 1417 1426, Count of Provence, Forcalquier, Piedmont, and Maine and Duke of Anjou 1417 1434, and Duke of Calabria 1426 1434. He was the eldest son and heir of Louis II of Anjou and Yolande of Aragon, Queen of Four Kingdoms. The throne of Aragon fell vacant in 1410 (Louis was then 6 years old) when king Martin I of Aragon died. Louis' mother Yolande was the surviving daughter of sonless King John I of Aragon, Martin's predecessor. They claimed the throne of Aragon for the young Louis.