Venice didn’t appear out of nothing – there was something before which led to the Venice we know as the Serenissima.
The “Chronicon Altinate” is one of the central medieval sources to early Venetian history, used extensively since it was written.
Translation of the parts related to Venice of the “De Administrando Imperio” (c.950) by Constantine VII Porphyrogenitus.
This document is the earliest description of the translation of St Mark to Venice in 827–828, and also of early Venice. This is the original Latin text.