↑ Find a Grave, database and images (https://www.findagrave.com/memorial/176516323/anna-maria_barbara-petre : accessed 21 November 2021), memorial page for Anna Maria Barbara Radclyffe Petre (1716–31 Mar 1760), Find a Grave Memorial ID 176516323, citing St. Edmund and St. Mary Churchyard, Ingatestone, Brentwood Borough, Essex, England ; Maintained by Todd Whitesides (contributor 47553735) .
See also:
Wikipedia entry for her father, 3rd Earl of Derwentwater [1]
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