Probinus was Patriarch of Aquileia in Grado, from 569 to 570, during the Lombard invasion of Venetia, succeeding Paulinus and followed by Elias
Venice had its own church organisation from the 800s, but the origins go back to before the Lombard invasion, and events in the Eastern Roman Empire.
The complete list of the Patriarchs of Grade, Patriarchs of Grado in Venice, and Patriarchs of Venice, since 717 until today