Waitz, Georg. Scriptores rerum Langobardicarum et Italicarum saec. 6.-9 in Monumenta Germaniae historica. Hannoverae : impensis Bibliopolii Hahniani, 1878.
Venetia existed within the Exarchate of Ravenna, as part of the Byzantine Empire, and what happened in the Exarchate mattered to Venetia.