Thomas Pitt of Blandford married Lady Frances Ridgeway in 1717 and was created Baron Londonderry in 1719. His father, a Governor of Fort St. George India, had fostered the family fortune when he sold an Indian diamond (still in the Crown of France) to the French royal family for a huge profit. His nephew was to become the famous statesman and Prime Minister. See D.S. Howard, Chinese Armorial Porcelain, vol. I, p. 184.