Iohannes VI (also Giovanni or John) was archbishop of Ravenna from 726 until his death in 744, and therefore during the iconoclast riots of 726–727 and the raids of king Liutprand in the early 740s.
From 737 to 742 the Duchy of the Venetians wasn’t ruled by dukes, but by military commanders with the Byzantine title of “magister militum”.
An excerpt of the “Liber Pontificalis” for Pope Zachary about Lombard attacks on Ravenna around 742.
The eventful reign of John VI, bishop of Ravenna (726–744), from the “Liber pontificalis ecclesiae Ravennatis”.