Lady Harriet Pitt (née Villiers; 1680 – 21 October 1736) was an Anglo-Irish noblewoman who was the mother and grandmother of two British prime ministers, William Pitt the elder and William Pitt the younger.
[1] Villiers was born into Anglo-Irish nobility as the daughter of Edward FitzGerald-Villiers and the Irish heiress Katherine FitzGerald.
[2] In 1704, she married Robert Pitt, who was elected to the House of Commons in the 1705 general election.
[3] Together Harriet and Robert had four children: Villiers died in 1736 and was buried at Layston Church in Buntingford, Hertfordshire.
[8] Her mother and her son are buried at Westminster Abbey.