Rhine

The Romans too made the passage of the Rhine a source of tribute, and Seneca relates that a toll was paid for going over bridges.

Thus Tacitus in speaking of the Usipians and Tencterians, who border on the Cattians, says, “their territory lies on the banks of the Rhine, where that river, still flowing in one regular channel, forms a sufficient boundary.

We have clear evidence that between the great fortresses which, disposed along the line of the Rhine and Danube, long secured the frontier of the Empire against its barbarian neighbours, there extended a succession of strips of land, the agri limitrophi, which were occupied by veteran soldiers of the Roman army on the terms of an Emphyteusis.