Richard Heuberger (1930). "Natio Noricorum et Pregnariorum". Veröffentlichungen des Museum Ferdinandeum in Innsbruck, No. 10, p. 7.
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Karl Maria Mayr (1949). "Der Grabstein des Regontius aus der Pfarrkirche in Bozen". Der Schlern, 23, pp. 302-303.
As reported by Paulus Diaconus in his Historia Langobardorum, V 36, ed. Georg Waitz, MGH Scriptores rerum Langobardicarum, Hannover 1878, p. 35: comes Baioariorum quem illi gravionem dicunt.