During the Roman period, the Limes romanus was a system of military strongholds along the Danube which protected Roman provinces against attacks of German tribes. Initially wooden camps for Roman troops, they were reconstructed during the reign of the Flavians to become wooden camps for the legions – castrum legionis and of their auxiliary corps – castellum. The most significant Roman stronghold in the Pannonia province was Carnuntum, situated next to the present-day village of Petronell in Austria. This Roman camp was built there by Tiberius during the war with the Marcomannis in 6 A.D. The camp was later re-built into...