Ceneda is a town in the Veneto region, and the centre of a Lombard duchy in the early Middle Ages.
The Pactum Lotharii was a treaty between the Duchy of the Venetians and the Holy Roman Empire, or parts thereof, from 840.
Venice started as a Byzantine duchy, ruled by a “dux”, but at some point, they started choosing their own dux — or doge. When, or even who, is not clear.
The account of the Lombard conquest of the remaining parts of Byzantine Venetia in the 600s — from “Historia Langobardorum” by Paul the Deacon.
The invasion of the Lombards in 568 was only the first part of the Lombard conquest of the Byzantine province of Venetia.