 The Roman sources had little interest in events in Illyria from the campaigns of Augustus in 35–33 BC to 16 BC.Cassius Dio wrote that in that year the governor of Illyria for 17–16 BC, Publius Silius Nerva, went to fight in the Italian Alps because there were no troops there.Some Pannonians and Noricans entered Istria and pillaged it.