Importance of a stipulative lexicon to perform diachronical comparison among law systems and institutions developing in time. Before independence (from antiquity to 741 a.D.). The Veneti and Roman rule. Evolution of the lagoon and its population. From antiquity to the early middle ages:
the decline and fall of the Roman Empire in the West. Justinian at the rescue: The Gothic war. The Langobard invasion and its outcome. Life on the lagoon. Terminatio Liutprandina. The age of Ducatus (742-1143). Dux et populus Veneticorum: a diarchy.