In Romeyka it is preserved. One possibility is that the speakers of this dialect are the direct descendants of the ancient Greeks who lived along the Black Sea coast before the 6th or 7th century BC, when the area was first colonized.

But they are also likely to be descendants of indigenous peoples or a migratory tribe who were forced to speak the language of the ancient Greek colonists.

The inhabitants of this region are devout Muslims, which is why they were allowed to remain in Turkey after the Treaty of Lausanne of 1923.

http://www.enallaxnews.gr/2015/12/04/vretanoi-apokalyptoun-fyli-stin-tourkia-pou-milaei-arxaia-ellinika/#prettyPhoto

Speech by the President of the Hellenic Parliament Mr. Nicholas Voutsis during the parliamentary discussion of the State Budget 2016 The President of the Hellenic Parliament at the National Archaeological Museum