But in five other directions also the frontiers were unregulated.
The German frontiers afford most evidence of its prosperity.
The emperor's chief work was guarding the frontiers and establishing military positions.
Starting from Regensburg in May 1189, the German army marched quietly through Hungary; but difficulties arose, as they had arisen in 1147, as soon as the frontiers of the Eastern empire were reached.
But all round these, as far as the frontiers, the country is inhabited by the other races, which, as a rule, occupy it in large, compact and uniform ethnographical groups.