In ancient Greek, accusative case for masculine nouns was always with -ν in the end. For example τον άνθρωπον, τον πολίτην.
In modern Greek, it doesn't 't happen any more. We just say τον άνθρωπο, τον πολίτη.
This change is not recent, however I am not aware when it occurred.
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.