confusing part is the AP and GS ( lecce ) both known as messapic and both with a high R1a-M17 ............clearly GS is greek or maybe they might mean epirote.
and both similar in E-V13
.
plus I have doubts like this article that I read
https://www.researchgate.net/public..._Apulia_in_the_fifth_and_fourth_centuries_BCE
that messapic is Illyrian.
.
If it is Illyrian I think it might be to do with the
https://en.wikipedia.org/wiki/Iapydes
who either sailed from the north Adriatic sea near istria or where brought to Apulia by the seafaring Liburnians who at that stage should have still owned corfu
In that article it never says that Messapic isn’t Illyrian? R1a in Puglia could be Slavic in origin and probably has nothing to do with Illyrians and Greeks.
This paragraph from the Molise Croats page on wikipedia talks about the history of Slavs in Italy which isn’t limited to Molise Croats.
”[FONT="]The [/FONT]
Adriatic Sea[FONT="] since the [/FONT]
Early Middle Ages[FONT="]connected the Croatian and Italian coast.[/FONT]
[11][FONT="]The historical sources from 10-11th centuries mention Slavic incursions in [/FONT]
Calabria[FONT="], and [/FONT]
Gargano[FONT="] peninsula.[/FONT]
[11][FONT="] [/FONT]
Gerhard Rohlfs[FONT="] in dialects from Gargano found many old Croatian lexical remains, and two toponyms [/FONT]
Peschici[FONT="]([/FONT]
*pěskъ-[FONT="]) and [/FONT]
Lesina[FONT="] ([/FONT]
*lěsь[FONT="], forest), which indicate [/FONT]
Chakavian dialect[FONT="].[/FONT]
[12][FONT="] In 12th century are confirmed toponyms [/FONT]
Castelluccio degli Schiavoni[FONT="] and [/FONT]
San Vito degli Schiavoni[FONT="].[/FONT]
[11][FONT="] In 13th and until 15th century toponyms [/FONT]
Slavi cum casalibus[FONT="] ([/FONT]
Otranto[FONT="], 1290), [/FONT]
Castellucium de Slavis[FONT="] ([/FONT]
Capitanata[FONT="], 1305), [/FONT]
casale Sclavorum[FONT="]([/FONT]
Lavorno[FONT="], 1306), [/FONT]
clerici de Schalvis[FONT="] ([/FONT]
Trivento[FONT="], 1328), [/FONT]
S. Martini in Sclavis[FONT="] (Marsia, 13th century), [/FONT]
S. Nikolò degli Schiavoni[FONT="] ([/FONT]
Vasto[FONT="], 1362).[/FONT]
[13][FONT="] In 1487 the residents of [/FONT]
Ancona[FONT="]differed the [/FONT]
Slavi[FONT="], previously settled, and the newcomers [/FONT]
Morlacchi[FONT="].[/FONT]
[10][FONT="] In 16th century, [/FONT]
Abraham Ortelius[FONT="] in his [/FONT]
Theatrum Orbis Terrarum[FONT="] (1570), West of Gargano in today's province of Molise mentioned [/FONT]
Dalmatia[FONT="],[/FONT]
[14][FONT="] and on Gargano also exist cape [/FONT]
Porto Croatico[FONT="] and cove [/FONT]
Valle Croatica[FONT="].[/FONT]
[15]”
https://en.m.wikipedia.org/wiki/Molise_Croats
This probably explains the R1a.
As for Iagypians and the Illyrian link, these 3 haplogroups shared between Albanians and Pugliese give a nice support, keep in mind that Puglia also has very little Arbereshe settlements (3 in total, 2 in Foggia and 1 in Taranto), so this would mean the connection is quite old.