the Italian peninsula being Byzantine Greek...ho hum....that fact does not give the Roman Bishop the right to keep the relics that were stolen over the objections of the holy men who cared for them at the time and have been kept for so many years in Bari.
The saint lived and died in the land that is now part of the country of Turkey. In that sense, the Turks claim him as their own — he was not a Turk ethnically, that’s certain, but he was also most likely not a Greek ethnically, maybe with some Greek blood, but not A Greek. He would have considered himself Roman. Ethnically he may have been any one of, or a mixture of Ionian Greek, Lydian, Armenian, Syrian, Roman, Galatian, Persian etc. etc. Linguistically, he was pretty definitely Latin, with a knowledge of Greek. Religion-wise he was Christian of the orthodox (with a small ‘o’) faith.