Pierce Butler (1774–1846)
Pierce Butler (6 May 1774 – 18 August 1846) was an Irish politician in the United Kingdom House of Commons.
Butler was the son of Edmund Butler, 11th Viscount Mountgarret and Lady Henrietta Butler.
He married Anne March, daughter of Thomas March, in 1800.
They had eleven children including:
He was elected to the United Kingdom House of Commons as Member of Parliament for County Kilkenny in 1832, and held the seat until 1846.
In the House he spoke against Tithe enforcement and against the continuation of the Act of Union.
He served as M.P. with his son.
Butler gained the rank of Colonel in the service of the Kilkenny Militia.
He died on 13 June 1846 at age 72.
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Pierce Somerset Butler
Pierce Somerset Butler (26 January 1801 – 28 July 1865) was an Irish politician in the United Kingdom House of Commons.
He was the son of Hon.
Pierce Butler and Anne March.
He married Jessy Anne Bryan on 3 February 1835 in London at St George's, Hanover Square.
They had two daughters.
He attended Trinity College Dublin.
Later he was elected to the United Kingdom House of Commons as Member of Parliament for County Kilkenny in 1843, and held the seat until 1852.
For the first three years he served in this position with his father.
Like his father he was not in favour of the Act of Union and discussed the repeal of this Act.
Butler was also Chairman of the Waterford and Kilkenny Railway Company.
In 1854 he was involved in the Case of Pierce Somerset Butler v Viscount Mountgarret.
"Verdict for plaintiff who thus came into a peerage, defendant being proved illegitimate"

Question: Who is Pierce Somerset Butler's paternal grandmother?
Answer: Lady Henrietta Butler