Yes, yes, regarding Sicily (and all of Southern Italia up to Benevento)! They were all Greek/Byzantine Rite. Magna Greaca covered much of it in pre-Christian times.
Many Latin Rite families in these regions still treasure ancient icons, the origin of which they are at a loss to explain.
There are still nine Greek-speaking villages in Salento, a part of the Province of Lecce in the Region of Puglia.
In Calabria, Basilicata, Puglia, Campagna, and Sicily there are 40-50 Albanian/Arberesh-speaking villages.
The religious history there is fascinating! And the Italo-Albanians stand as the unique example of Eastern Rite Christians who were never told to reject Eastern Communion and accept Western Communion. They arrived (in the late 1400s) before the idea of a true break in communion had taken hold. They simply fell under a different Patriarch in their new home.
In Christ,
Andrew