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It is nice you brought some evidence about genetic difference between Islanders and Mainland Greeks.
http://www.fordham.edu/halsall/med/mango.aspAnother source, the so-called Chronicle of Monembasia, states that in the year 587-8 the Turkic Avars (with whom the Slavs were usually allied)
"captured all of Thessaly and all of Greece, Old Epirus, Attica and Euboea. Indeed, they attacked the Peloponnese and took it by war; and after expelling and destroying the native Hellenic peoples, they dwelt there. Those who were able to escape their murderous hands were scattered here and there. Thus, the citizens of Patras moved to the district of Reggio in Calabria, the Argives to the island called Orobe, the Corinthians to the island of Aegina.... Only the eastern part of the Peloponnese, from Corinth to Cape Maleas, was untouched by the Slavonians because of the rough and inaccessible nature of the country."
There is some doubt concerning the exact date of these events, but it is undeniable that at the end of the sixth century and the beginning of the seventh, when the Danubian frontier completely collapsed, practicallv the entire Balkan peninsula passed out of imperial control. Only a few coastal outposts, such as Mesembria on the Black Sea, Thessalonica, Athens and Corinth, held out. Elsewhere the old population sought refuge on off-shore islands, as it did on Monembasia, or emigrated to Italy. The domain of barbarism extended as far as the outer defences of Constantinople - the so-called Anastasian Long Walls which described a wide arc from the Black Sea to Selymbria (Siliv on the Sea of Marmora - but even these had soon to be abandoned.
The last important Slavonic settlement was that of the Serbs and Croats who in the reign of Heraclius occupied the lands where they still dwell. Then, in 680, came the Turkic Bulgars and conquered the country that bears their name, where they were eventually assimilated by the sitting Slavonic population. The barbarization of the Balkans began to be reversed only towards the ed of the eighth century, but by that time its effects had become permanent.
Perhaps the true Hellenes migrated to islands during Avar raids and Slavic subjects of Avars might have been settled to mainland Greece.
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