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Tsakonian

Tsakonian is a minority language of Greece, spoken by an estimated few hundred people, who are mostly elderly. It is significant as the last known surviving descendent of the Doric dialect of Ancient Greek, and thus the only one of the modern Hellenic languages not to descend from Koine Greek. Although it is usually considered a dialect of Modern Standard Greek (particularly by Greek linguists), it is not mutually intelligible with it, and by now the point of divergence is thousands of years ago.

To my mind the language’s situation is similar to that of the Istriot language of Croatia, which is also the last known survivor of a linguistic subfamily (in Istriot’s case, Dalmatian Romance), and also has only a few hundred speakers.