The Exarchate of Ravenna was an ad hoc organisation of the Byzantine dominions in Italy, established c.584, in the face of the Lombard invasion and gradual conquest of much of the Italian peninsula.
The doges Deusdedit (742-755), Galla (755β756), Domenico Monegario (756β764), Maurizio Galbaio (764β787) and his son Giovanni (787β804), from the “Istoria Veneticorum” by John the Deacon.
The Chronicon Altinate contains an apocryphal account of how duke Paulicius was killed in a factional fight between people from Equilo and Heraclia.
Venetia existed within the Exarchate of Ravenna, as part of the Byzantine Empire, and what happened in the Exarchate mattered to Venetia.