The Chronicon Altinate, Altino Chronicle or Origo civitatum Italie seu Venetiarum is one of the oldest sources for the history of Venice.
It is not a true chronicle, but rather a compilation of documents and legends about the emergence of Venice and the origin of the Venetians.
There are also lists of bishops, popes, doges and emperors, as well as church registers and chronicle entries.
Compared to the earlier Chronicon Venetum et Gradense, it is "a more richly articulated and satisfyingly detailed account of a primitive foundation of the city", taking its origins back to Orpheus and Troy, and replacing the story of an attack by the Lombards with an earlier attack by Attila the Hun, portraying the Venetians as Christians fleeing pagans.
[3] It continues by recounting the story of the citizens of Altinum (modern Quarto d'Altino) taking refuge in Torcello, to which they transferred their church with the relics of Saint Heliodorus, their founding bishop.