Question: When did William Le Poer Trench's father die?

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: Richard Trench, 2nd Earl of Clancarty
Richard Le Poer Trench, 2nd Earl of Clancarty, 1st Marquess of Heusden (19 May 1767 – 24 November 1837), styled The Honourable from 1797 to 1803 and then Viscount Dunlo to 1805, was an Irish peer, a nobleman in the Dutch nobility, and a diplomat.He was an Irish, and later British, Member of Parliament and a supporter of Pitt.Additionally he was appointed Postmaster General of Ireland, and later, of the United Kingdom.
Knowledge 1: Richard Trench, 2nd Earl of Clancarty
Richard Le Poer Trench, 2nd Earl of Clancarty, 1st Marquess of Heusden (19 May 1767 – 24 November 1837), styled The Honourable from 1797 to 1803 and then Viscount Dunlo to 1805, was an Irish peer, a nobleman in the Dutch nobility, and a diplomat.He was an Irish, and later British, Member of Parliament and a supporter of Pitt.Additionally he was appointed Postmaster General of Ireland, and later, of the United Kingdom. [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.

Answer: 26 April 1872