He died in 1261 in the Franciscan friary in Kiel, which he himself had founded, whereupon Holstein was divided between his sons John (of Holstein-Kiel) and Gerhard (of Holstein-Itzehoe).
Dia meninggal pada tahun 1261 di biara Fransiskan di Kiel, yang didirikannya, dimana Holstein terbagi antara anak-anaknya Johann (Holstein-Kiel) dan Gerhard (Holstein-Itzehoe).