Question: Who is the paternal grandmother of William Le Poer Trench?

Knowledge 1: William Le Poer Trench
Colonel The Hon.William Le Poer Trench CVO, JP (17 June 1837 – 16 September 1920) was an Anglo-Irish politician and British army officer.He was the third son of William Trench, 3rd Earl of Clancarty and Lady Sarah Juliana Butler.He married Harriet Maria Georgina Martins, daughter of Sir William Martins, on 21 April 1864.He fought in the Second Opium War between 1857 and 1858, commanding a ladder company at the capture of Guangzhou and Nankow, and was mentioned in despatches.He gained the rank of Colonel in the service of the Royal Engineers.Between 1872 and 1874, he was Member of Parliament (MP) for County Galway, having unseated the elected MP, John Philip Nolan, on petition; the case was one of the most controversial Irish cases of its time and permanently damaged the reputation of the judge, William Keogh.He held the office of Justice of the Peace for Westminster, London, Buckinghamshire, and Middlesex.He was made a Commander of the Royal Victorian Order in 1912. [SEP] Knowledge 2: William Trench, 3rd Earl of Clancarty
William Thomas Le Poer Trench, 3rd Earl of Clancarty, 2nd Marquess of Heusden (21 September 1803 – 26 April 1872), styled Viscount Dunlo between 1805 and 1837, was an Irish peer, as well a nobleman in the Dutch nobility.He was educated at St John's College, Cambridge.Trench was born in Castleton, County Kildare, Ireland the son of Richard Trench, 2nd Earl of Clancarty and Henrietta Margaret Staples.On 8 September 1832, he married Lady Sarah Juliana Butler.They had six children.
Knowledge 1: William Le Poer Trench
Colonel The Hon.William Le Poer Trench CVO, JP (17 June 1837 – 16 September 1920) was an Anglo-Irish politician and British army officer.He was the third son of William Trench, 3rd Earl of Clancarty and Lady Sarah Juliana Butler.He married Harriet Maria Georgina Martins, daughter of Sir William Martins, on 21 April 1864.He fought in the Second Opium War between 1857 and 1858, commanding a ladder company at the capture of Guangzhou and Nankow, and was mentioned in despatches.He gained the rank of Colonel in the service of the Royal Engineers.Between 1872 and 1874, he was Member of Parliament (MP) for County Galway, having unseated the elected MP, John Philip Nolan, on petition; the case was one of the most controversial Irish cases of its time and permanently damaged the reputation of the judge, William Keogh.He held the office of Justice of the Peace for Westminster, London, Buckinghamshire, and Middlesex.He was made a Commander of the Royal Victorian Order in 1912. [SEP] Knowledge 2: Robert Le Poer Trench
Robert Le Poer Trench( c.1811 – 8 February 1895) was a judge and an Attorney- General of Victoria.Trench was the third son of Ven. Charles Le Poer Trench, D.D., of Ballinasloe, County Galway, Archdeacon of Ardagh, and grandson of the first Earl of Clancarty.He entered as a student of the Middle Temple in May 1839, and was called to the Bar in June 1842.Having emigrated to Victoria, he was clerk of petty sessions at Kilmore, Victoria and afterwards at Ballarat.In 1855 he was admitted to the Victorian Bar, and quickly obtained a large practice, especially in mining cases.Though he never entered parliament he was Attorney- General in the first Graham Berry Government from August to October 1875, and in Berry's second Administration, from May 1877 to March 1878, when he was appointed a Commissioner of Land Tax, and a County Court Judge in April 1880.Mr. Trench, who was appointed Q.C. in 1878, subsequently retired on a pension.
Knowledge 1: Robert Le Poer Trench
Robert Le Poer Trench( c.1811 – 8 February 1895) was a judge and an Attorney- General of Victoria.Trench was the third son of Ven. Charles Le Poer Trench, D.D., of Ballinasloe, County Galway, Archdeacon of Ardagh, and grandson of the first Earl of Clancarty.He entered as a student of the Middle Temple in May 1839, and was called to the Bar in June 1842.Having emigrated to Victoria, he was clerk of petty sessions at Kilmore, Victoria and afterwards at Ballarat.In 1855 he was admitted to the Victorian Bar, and quickly obtained a large practice, especially in mining cases.Though he never entered parliament he was Attorney- General in the first Graham Berry Government from August to October 1875, and in Berry's second Administration, from May 1877 to March 1878, when he was appointed a Commissioner of Land Tax, and a County Court Judge in April 1880.Mr. Trench, who was appointed Q.C. in 1878, subsequently retired on a pension. [SEP] Knowledge 2: Brinsley Le Poer Trench, 8th Earl of Clancarty
William Francis Brinsley Le Poer Trench, 8th Earl of Clancarty, 7th Marquess of Heusden( 18 September 191118 May 1995) was a prominent ufologist.He was an Irish peer, as well as a nobleman in the Dutch nobility.

Answer: Henrietta Margaret Staples