The son of Felix Calvert, a brewer from Southwark and Hunsdon, he was educated at Harrow School and at Trinity Hall, Cambridge.
Their son, Felix (d. 1862), fought at the Battle of Waterloo[3] while their second daughter Isabella (1793–1862) married Sir James Stronge, Bt.
[4] They lived at Hunsdon House in Hertfordshire, which he inherited from his uncle (also named Nicolson Calvert).
[2] He commanded the Eastern Battalion, Hertfordshire Local Militia, when it was raised at Hertford in 1808.
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