[10] In prehistoric times, the south-eastern tracts of the Balkan Peninsula were inhabited by Armenians, who were eventually compelled to retreat to Asia Minor, about 700 B.C. The next inhabitants were the Phrygians, who possessed a well-developed civilization, and penetrated very far westward; but with the invasion of the Thracians from the north, the Phrygians were likewise forced to migrate to Asia Minor and only a few scattered groups were left between the Danube and the Balkan Mountains, where they remained until the Roman invasion. Unlike the above-mentioned Semitic races, the Pelasgians and Lepese, who formed the aboriginal population of Greece, were of pure Indo-European stock. They were eventually conquered by the Hellenes, and the illustrious Greek nation sprang from the intermingling of these three tribes. The dawn of history shows the great Peninsula of Eastern Europe divided between three tribes. The Greeks dwelt south of Heliakmon and Olympus, the Thracians west of the Tekton valley in the eastern portion of the Peninsula, and the Illyrians west of the Pindus. Their territory extended north as far as the site of modern Vienna, and south to the Gulf of Corinth. Of these three peoples the Greeks alone attained to a high degree of civilization and culture. They founded several colonies on the narrow coast-line of Macedonia, but the greater part of the Peninsula to the west of the Vardar remained Illyrian, and, to the east of the Vardar, Thracian. Only the wealthier classes and the royal family from which Alexander the Great traced his descent migrated into these countries from Grecian Thessaly in search of conquest. The Roman invasion was followed by considerable colonial development. Under the sound administrative policy of the Romans a certain level of civilization penetrated to the greater part of the Peninsula, and a Latinized dialect became the general language. The Thracians very speedily became Romanized, as did most of the Illyrians; the Hellenes alone retained their national distinction. The Illyrians eventually disappeared from Macedonia; but their kindred tribe, the Albanians (Skipetars, Arnauts) remain there to this day, although they show a strong admixture of ancient Roman and Slav blood. The _Roumanians_ are the product of a lingual and racial mixture of Thracian, Roman and Slav elements. The Great Migration broke up the Roman Empire (476 A.D.) and Europe was re-distributed—the resulting racial boundaries having for the most part persisted to this day. The Germanic tribes set their mark on the North and West, and the Slavs on the East of Europe. In 525 A.D. the Slavs under the name of “Εκλανεοι” are mentioned as dwelling on the lower Danube. From that time, and for a century, they waged fierce warfare against the Eastern Empire, until the latter became exhausted, and the Balkan Peninsula was left open to the invaders from the north.