What is "nakhichevan-on-don"

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Nakhichevan-on-Don (, Naxičevan’-na-Donu), also known as New Nakhichevan (, Nor Naxiĵevan; as opposed to the "old" Nakhichevan), was a city near Rostov-on-Don, in southern Russia founded in 1779 by Armenians from Crimea. It retained the status of a city until 1928 when it was merged with Rostov.