The Great Illyrian Revolt, (Bellum Batonianum or Pannonian Revolt), a series of military conflicts between an Illyrian alliance and the Roman Empire, begins among the Daesitiates of what is today central Bosnia under their leader Bato but are soon joined by the Breuci and numerous other Illyrians.

The four-year war, which lasts from CE 6 to 9, sees huge concentrations of Roman forces in the area, (on one occasion the legions and their auxiliaries in a single camp), with whole armies operating across the western Balkans and fighting on more than one front.

On August 3, CE 8, the Breuci of the Sava Valley surrender, but it takes another winter blockade and a season of fighting before the surrender of the Daesiates comes in CE 9.

It takes the Romans three years of hard fighting to quell the revolt, which the Roman historian Suetonius will describe as the most difficult conflict faced by Rome since the Punic Wars two centuries earlier.

All Illyrians now become subject to Roman rule.