Jelaskan Catatan dari Erich dari Friuli

Einhard. Vita Caroli Magni. translated by Samuel Epes Turner. New York: Harper & Brothers, 1880.

Paulinus II of Aquileia. "Versus Paulini de Herico duce." In L'Oeuvre Poétique de Paulin D'Aquilée. Edited by Dag Norberg. Stockholm: Almquist and Wiskell International, 1979.