Page "Pannonia (Roman province)" Paragraph 5

The first inhabitants of this area known to history were the Pannonii ( Pannonians ), a group of Indo-European tribes akin to Illyrians.

From the 4th century BC it was invaded by various Celtic tribes.

Little is heard of Pannonia until 35 BC, when its inhabitants, allies of the Dalmatians, were attacked by Augustus, who conquered and occupied Siscia ( Sisak ).

The country was not, however, definitely subdued by the Romans until 9 BC, when it was incorporated into Illyricum, the frontier of which was thus extended as far as the Danube.