Note 285 — Chapter XV · THE EMPIRE AS AN INTERNATIONAL POWER.
Reading edition
Thus we are told of the Emperor Charles the Bald, when he confirmed the election of Boso, king of Burgundy and Provence, 'Dedit Bosoni Provinciam (sc. Carolus Calvus), et corona in vertice capitis imposita, eum regem appellari iussit, ut more priscorum imperatorum regibus videretur dominari.'—Regin. Chron. Frederick II made his son Enzio (that famous Enzio whose romantic history every one who has seen Bologna will remember) king of Sardinia, and also erected the duchy of Austria into a kingdom, although for some reason the title seems never to have been used; and Lewis IV gave to Humbert of Dauphiné the title of King of Vienne, A.D. 1336.