Hester Pitt, Countess of Chatham

Hester Pitt, Countess of Chatham, 1st Baroness Chatham , who was 1st Baroness Chatham in her own right, was the wife of William Pitt , 1st Earl of Chatham, who was Prime Minister of Great Britain from 1766 to 1768. and sister of George Grenville, who was Prime Minister of Great Britain from 1763 to 1765. She was also a niece of the noted Whig politician Richard Temple, 1st Viscount Cobham, who had served as William Pitts mentor.

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Source: Wikipedia