Here is something interesting that Tomovsk posted; probably relevent here also.
[ the landmark thucydides, page 4 , 1.3.1 - 1.3.3 ]
" there is also another circumstance that contributes not a little to my conviction of the weakness of ancient times. before the trojan war there is no indication of any common action in hellas, nor indeed of the universal prevalence of the name ( hellas / hellenes ); on the contrary, before the time of hellen son of deucalion, no such name existed, but the country went by the names of different tribes, in particular of the pelasgian. it was not till hellen and his sons grew strong in phthiotis, and were invited as allies into the other cities, that one by one they gradually acquired from the connection the name of hellenes; though a long time elapsed before that name could fasten itself upon all.
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