Chiswell was born Richard Muilman, but assumed the extra surnames of Trench and Chiswell by royal licence on 28 November 1772 after the death of his mother’s brother, Richard Chiswell, when he inherited a fortune of £120,000 and Debden Hall in Essex.
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In 1756 (then) Richard Muilman married Mary (c1732-1807), a daughter of Dr James Jurin.
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