To my knowledge, Pannonia was Roman province stretching across today's Hungary, Austria and Croatia. Who were original actually inhabitants of this lands? Was there such thing as Pannonions? Were they Illyrians or related to Illyrians?
Anyway, interesting region. Very old and apparently quite unique looking compared with other parts of Europe.

Pannonians: http://en.wikipedia.org/wiki/Pannonians#Pannonian_tribes
Pannonia is Slavic Homeland by early Slavic chronicles and some modern Slavists.

Every year there is a festival "Celtic Nights" preformed there
image  :D

Looks great :D