Mary Heathcote was the daughter of Lady Elizabeth Parker and Sir William Heathcote, 1st Baronet, who married in 1720. In 1749, she married Thomas Parker, the 3rd Early of Macclesfield. They had three children–Lady Elizabeth Parker (d. 1829), George Parker, 4th Earl of Macclesfield (1755-1842) and Thomas Parker, 5th Earl of Macclesfield (1763-1850). From March 1764, she was known as the Countess of Macclesfield. She died in 1812.
References
‘Lady Elizabeth Parker’, The Peerage http://www.thepeerage.com/p2739.htm#i27389 (accessed 7 Feb 2017).
‘Mary Heathcote’, The Peerage http://www.thepeerage.com/p2739.htm#i27387 (accessed 7 Feb 2017).
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