The Lombard invasion of Byzantine Italy in 568 was a pivotal event in Venetian history, as it kicked off the movement towards a distinct Venetian society, culture and, ultimately, state.
Excerpts related to “Venetia” and the “Veneti” from the “Naturalis Historia” by Pliny the Elder (1st century)
The Lombard invasion of Venetia in 568 — from “Historia Langobardorum” by Paul the Deacon.
The Birthday of Venice of is traditionally on March 25th, 421 CE, but this is far more legend than historical truth.