Until we have samples later than Mycenaeans we don`t know how Peloponnesians were just before Slavs. They were surely similar but let`s first account for Dorians and internal migrations.
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Bulgars never invaded peloponnese and most of central Greece, and avars didn't make permanent settlements.
The people who really created settlements in southern Greece (peloponnese included) and interacted with natives were mainly Slavs and Franks (see gasmuloi), meanwhile Albanians did this in specific parts of the country and the same goes for Venetians (in coastal cities)
Now of course the more north and more inland you go in the mainland the more slavic admixture you should expect, meanwhile franks were limited to southern mainland
But like kostantinos correctly said, mycaeneans were very likely somewhat more "neolithic" and less steppe than later Greeks (Dorians Ionians etc) so probably peloponnese wasn't exactly like mycaeneans from 10th century BC to 6th century AD but a little more steppe after Dorian invasion
I am sorry to burst your bubble but the Frankish and Venetian contribution is very miminal compared to Slavic one.
Peloponnesians can be modelled as 65% Myceaneans and 35% Medieval Slavic. Early Slavs were similar to northern Slavs but not indentical because Northern Slavs have some Baltic and Germanic Admixture.
Given the fact that Albanians were 90% similar to Peloponnesians Greeks before entering Peloponnese it safe to assume that most of that 35% comes from Slavs themselves.
There is no bubble to burst Slavs didn't have a huge impact or genetic influence in Peloponnese 14% is the maximum of Slavic admixture Peloponnesians can have and in many of them its significantly lower if you go to Peloponnese in alot of places you can observe by phenotype alone that these people are not Slavs except of if you want to cherrypick and focus on a handfull individuals who might resemble Slavs
I don't know if they can modelled that way but according to the known studies they are about 65%-70% Mycanaean like plus 30% otherQuote:
Peloponnesians can be modelled as 65% Myceaneans and 35% Medieval Slavic. Early Slavs were similar to northern Slavs but not indentical because Northern Slavs have some Baltic and Germanic Admixture.
Given the fact that Albanians were 90% similar to Peloponnesians Greeks before entering Peloponnese it safe to assume that most of that 35% comes from Slavs themselves.
I don't think that the 30% all of it is from medieval Slavs if you think that then i think you are an Idiot
The contribution of Venetians, Goths and Franks is one digit percentage so most of the 35% comes from Slavs. On the other hand what is considered Myceaneans is actually Paleo-Ballakanic to large extend, even though Thracians had their own differences they were still more similar to Ionian Greeks than most modern population expect for Sicilians, but most of it comes from ancient Greeks at least in Peloponnese.