Lady Petre was left pregnant and three months later gave birth to a son named Robert, who succeeded as 8th Baron immediately on birth.
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On 1 March 1712, the much sought after bride married Robert Petre, 7th Baron Petre, bringing him a large dowry of £50,000.
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Her son having died in 1742, Lady Stourton willed her property to her grandson, Robert Petre, 9th Baron Petre.
The two chief leaders were Lord Petre and Sir John Throckmorton, both members of old recusant families, who had suffered much in times past under the Penal Laws.
On 14 February 1786, in London, Lord Petre married Mary Bridget Howard (29 September 1767-30 May 1843), sister of the 12th Duke of Norfolk.