Pannonia was a province in the Roman Empire. It was about today's Hungary.
The Roman Pannonia lasted from Augustus' times until the fifth century.
In the second century Pannonia flourished and received many Roman citizens, who developed a rich farm economy.
It was temporarily increased under emperor Constantine the Great up to the actual Romanian mountains. The border was the so called "Devil's Dike".
When Attila attacked the area was destroyed and depopulated.
After the fall of the western Roman Empire, in Pannonia, the latinized population developed the Pannonian Romance. That lasted until the tenth century.