Conradin
Conrad III (25 March 1252 – 29 October 1268), called the Younger or the Boy, but usually known by the diminutive Conradin (German: Konradin, Italian: Corradino), was the last direct heir of the House of Hohenstaufen. He was Duke of Swabia (1254–1268) and nominal King of Jerusalem (1254–1268) and Sicily (1254–1258).