Holder-Egger, O. (ed). Agnelli qui et Andreas liber pontificalis ecclesiae Ravennatis in Waitz: Scriptores rerum Langobardicarum et Italicarum saec. VI-IX, p. 265–391. Hannover, 1878.
Venetia existed within the Exarchate of Ravenna, as part of the Byzantine Empire, and what happened in the Exarchate mattered to Venetia.