"The East India Company acquired control over the land that would become the city of Madras, piecemeal over 150 years. Fort St. George and the old Black Town –Muthialpet acquired in 1640 were expanded over thirty years for most of what is now Georgetown. The important town of Triplicane saw British control by the 1670s, and the towns of Egmore, Chetput, Pursalwalkam, and Kilpauk by the 1690s. the Company annexed Mylapore in 1749. By 1798, when the map ‘Limits of Madras as Fixed on 2 November 1789” was issued, Madaras acquired its modern outline. The city stayed “fixed” for well over a century. The only addition came in 1923, when the zamindari of Mambalam was ceded to Madras, and in 1946, and 1981, when the borders of the city were extended."
January 1, 1970
https://en.wikiquote.org/wiki/Chennai