Commentary Inf XXVIII 17-18

Two years after the defeat at Benevento, the Norman forces, now under Conradin, the grandson of the emperor Frederick II, suffered their final defeat near Tagliacozzo, in the Abruzzi, again at the hands of the forces of Charles of Anjou, who, after the battle, had Conradin put to death, thus ending the Hohenstaufen succession in Italy. Alardo was the French knight Érard de Valéry, who gave Charles the strategic advice that gained him military advantage on the field.