In 1268 Conradin, who had meanwhile come of age, invaded Italy to press his claim to the throne, but he was defeated at the Battle of Tagliacozzo and executed afterwards.
Aastal 1268 tungis Konradin, kes oli vahepeal täisealiseks saanud, Itaaliasse oma trooni tagasi nõudma, kuid võideti Tagliacozzo lahingus ja hukati hiljem.