Conradin--Ferdinand_II_of_Aragon

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). After his attempt to reclaim the Kingdom of Sicily for the Hohenstaufen dynasty failed, he was captured and beheaded.