In 1226, Henry's brother Louis IV, Landgrave of Thuringia, died en route to the Sixth Crusade,[REF] and Henry became regent for his under-age nephew Hermann II, Landgrave of Thuringia.
In 1242 Henry, together with King Wenceslaus I of Bohemia, was selected by Emperor Frederick II to be administrator of Germany for Frederick's under-age son Conrad.