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The European provinces—now as in the time of Zeno—had a far harder lot. The Slavs and Bulgarians repeatedly crossed the Danube and pressed over the desolated plains of Moesia to assail Thrace. More than once the Bulgarians defeated a Roman army in the field, and their ravages were at last pushed so far southward that Anastasius built in 512 the celebrated wall which bears his name, running from the Black Sea to Propontis, thirty-five miles west of Constantinople. These lines, extending for more than fifty miles across the eastern projection of Thrace, served to defend at least the immediate neighbourhood of the capital against the restless horsemen from beyond the Danube. Macedonia and Illyricum seem to have suffered much less than Thrace during this period; the Slavs who bordered on them were as yet not nearly such a dangerous enemy as the Bulgarians, while the Ostrogoths of Italy, on reconquering Pannonia, proved more restful neighbours to the north-western provinces of the empire than they had been in the previous century.