Question: What is the date of birth of Robert Petre, 9Th Baron Petre's father?
Sentence (from "Robert Petre, 9th Baron Petre"): Lord Petre was the son of Robert Petre, 8th Baron Petre (1713–1742), a renowned horticulturist, and Lady Henrietta Anna Mary Barbara Radclyffe (1714–1760), daughter of the 3rd Earl of Derwentwater (1689–1716) who was the grandson of Charles II by his mistress Moll Davis.
Relevant evidence: Yes