Roman soldiers conquered present day Trans-Danubian region in the middle of the 1st century. They later called the province Pannonia. The region became part of a highly organized state, the Roman Empire. The economic system was soon set up after the arrival of the Romans in Pannonia. Cash flow was soon in effect, Latin became the official language, religions typical of the Mediterranean widely spread, towns were built of stone, military premises set up, bridges, roads and buildings were constructed, which made Pannonia present in the 'blood stream' of the empire.