Hungary in its modern (post-1946) borders roughly corresponds to the Great Hungarian Plain (the Pannonian basin). During the Iron Age, it was at the boundary of Celtic, Illyrian and Iranian (Scythian) cultural spheres.
The name "Pannonian" comes from Pannonia, a province of the Roman Empire. Only the western part of the territory (the so-called Transdanubia) of modern Hungary formed part of the ancient Roman Province of Pannonia. The Roman control collapsed with the Hunnic invasions of 370