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Apart from the many valuable manors inherited from her father she also inherited the patronage of the Rolle pocket borough of Callington in Cornwall, and nominated in 1761 as its MP her Devon agent Richard Stevens (1702-1776), of Winscott, in the parish of Peters Marland, adjacent to Petrockstowe, who was the brother-in-law of Margaret's distant, but locally resident, cousin Henry Rolle, 1st Baron Rolle (1708-1750) of Stevenstone.