Charlemagne (748–814) was King of the Franks from 768, King of the Lombards from 774, and Roman Emperor (de facto, of the Carolingian Empire) from 800.
The “Chronicon Altinate” is one of the central medieval sources to early Venetian history, used extensively since it was written.
Venice was an independent state for almost a millennium, but it might note have been. It all hinged on a single battle fought in the Venetian lagoon in 810.