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Karachi was reputedly founded in 1729 as the settlement of Kolachi.  The new settlement is said to have been named in honour of Mai Kolachi , whose son is said to have slain a man-eating crocodile in the village after his elder brothers had already been killed by it. 
The city's inhabitants are referred to by the demonym Karachiite in English, and Karāchīwālā کراچی والا in Urdu.
Late Palaeolithic and Mesolithic sites discovered by a team from Karachi University on the Mulri Hills constitute one of the most important archaeological discoveries made in Sindh during the last 50 years. The earliest inhabitants of the Karachi region are believed to have been hunter-gatherers , with ancient flint tools discovered at several sites. A sea port called Barbarikon by the Greeks was situated in Karachi.