Upon Frederick's death on 13 December 1250, still involved in a war against Pope Innocent IV and his allies, he also succeeded him as King of Sicily.
Setelah kematian Friedrich pada tanggal 13 Desember 1250, masih terlibat dalam perang melawan Paus Innosensius IV dan sekutu-sekutunya, dia juga menggantikannya sebagai Raja Sisilia.