EX PRETERITUS

Looking at the history books, the conquest of Pannonia has parallels with the conquest of Britain. Both were invaded at roughly the same time; both had rebellions by the Celt tribes who lived there, who killed the earlier Roman settlers, and were put down with brutal force.
Roman resettlement started about 10 AD and the area became more important as the route to Dacia. The Danube became the frontier of the Roman world for hundreds of years. A fleet was maintained there and many forts and garrison towns were built . Larger roman settlements such as Mursa, Cibalia, Sirmium and Marsonia grew on the flat plain between the rivers Drava and Sava.
One would expect then, a rich deposit of roman coins in the region, and this is so, though coins from 1st century BC - 1st century AD have been very much fewer than expected.
The large amount of soldiery present locally in the mid-3rd century prompted the establishments of two mints in the region; at Siscia (Sisak) and Sirmium (Srijemska Mitrovice). Needless to say, coins from these mints are the most common. In fact, so many so-called rare coins have been rescued, that the rarity ratings for them have dropped considerably .

Provincial mints are those not classed as issuing imperial coinage. These abounded earlier in many city states, and later by roman colonies at the fringes of the empire. The most important one regarding finds in this region, is Viminacium in the province of Moesia Superior. This mint produced sestertius sized bronzes between the years 239 - 295, when elsewhere in the empire the quality of coinage was dropping and getting smaller. These coins are very common finds. In one area, Moesian coins of Philip (244-249) outnumbered even the later 4th century common types.
Other provincial coins are mainly from Moesia Inferior, Stobi in Macedonia and Nicaea in Bithynia (northern Turkey).