Conradin on the scaffold at Naples following the battle of Tagliacozzo in 1268. Conrad, aka the Younger, the Boy or Conradin, 1252 - 1268. Duke of Swabia (1254-1268, as Conrad IV), King of Jerusalem (1254-1268, as Conrad III), and King of Sicily (1254-1258, de jure until 1268, as Conrad II). From Ward and Lock's Illustrated History of the World, published c.1882.