The Liber pontificalis ecclesiae Ravennatis is the book of the bishops of Ravenna, from St Apollinaris until the mid-800s, written by the cleric Agnello Ravennate in the 830s.
The Venetians are mentioned twice in the biography of Sergius, archbishop of Ravenna (744–769, in the “Liber pontificalis ecclesiae Ravennatis”.
The eventful reign of John VI, bishop of Ravenna (726–744), from the “Liber pontificalis ecclesiae Ravennatis”.