Question: When was Henry Fitzgerald-De Ros, 21St Baron De Ros's father born?

Knowledge 1: Henry FitzGerald-de Ros, 21st Baron de Ros
Henry William FitzGerald-de Ros, 21st Baron de Ros (12 June 1793 – 28/29 March 1839) was a British nobleman, the son of Lord Henry FitzGerald and his wife Charlotte FitzGerald-de Ros, 20th Baroness de Ros.Fitzgerald-de Ros briefly served as Member of Parliament for the borough of West Looe from 1816 to 1818.In 1831, upon the death of his mother, he inherited the Barony of de Ros, the oldest surviving barony in the Peerage of England.He was an excellent whist player, but was involved in a gambling scandal in 1836.Lord de Ros was accused of cheating at Graham's Club by the trick of "sauter la coupe", and by marking the cards with his thumbnail.He sued his accusers for libel, but lost the case.He died not long after, and was commemorated by Theodore Hook with the punning epitaph, "Here lies the premier baron of England, patiently awaiting the last trump."He died in London, unmarried and without issue. [SEP] Knowledge 2: Lord Henry FitzGerald
Lord Henry FitzGerald PC (Ire) (30 July 1761 – 9 July 1829) was the fourth son of the 1st Duke of Leinster and the Duchess of Leinster (née Lady Emily Lennox).A younger brother was the revolutionary Lord Edward FitzGerald.
Knowledge 1: Henry FitzGerald-de Ros, 21st Baron de Ros
Henry William FitzGerald-de Ros, 21st Baron de Ros (12 June 1793 – 28/29 March 1839) was a British nobleman, the son of Lord Henry FitzGerald and his wife Charlotte FitzGerald-de Ros, 20th Baroness de Ros.Fitzgerald-de Ros briefly served as Member of Parliament for the borough of West Looe from 1816 to 1818.In 1831, upon the death of his mother, he inherited the Barony of de Ros, the oldest surviving barony in the Peerage of England.He was an excellent whist player, but was involved in a gambling scandal in 1836.Lord de Ros was accused of cheating at Graham's Club by the trick of "sauter la coupe", and by marking the cards with his thumbnail.He sued his accusers for libel, but lost the case.He died not long after, and was commemorated by Theodore Hook with the punning epitaph, "Here lies the premier baron of England, patiently awaiting the last trump."He died in London, unmarried and without issue. [SEP] Knowledge 2: Charlotte FitzGerald-de Ros, 20th Baroness de Ros
Charlotte Fitzgerald- de Ros, 20th Baroness de Ros of Helmsley( 24 May 1769 – 9 January 1831), also known as Lady Henry FitzGerald, was born Charlotte Boyle- Walsingham in Castlemartyr, County Cork, Ireland or in London, where she died.She was the daughter of the Hon. Robert Boyle, later Boyle- Walsingham( 1736 – 1780) and wife( m. 1759) Charlotte Hanbury Williams( d. 1790), daughter of Sir Charles Hanbury Williams and Lady Frances Coningsby.Her paternal grandparents were Henry Boyle, 1st Earl of Shannon and his second wife Lady Henrietta Boyle.She spent most of her childhood with her parents at the Boyle Farm mansion in Thames Ditton.( Her mother, the second daughter of Frances Coningsby, had bought this estate in 1784 from Lord Hertford, who was grieving over the death of his wife there two years earlier.)Charlotte did much artistic decoration in Boyle Farm and much of it has survived to the present day.In London on 3/4 August 1791, more than a year after her mother's death, Charlotte married Lord Henry FitzGerald, a member of the Duke of Leinster's family.After petitioning King George III in 1790, she eventually( in 1806) was able to end the abeyance to the Barony of de Ros, the most ancient baronial title in England, in her favor.This was accomplished despite her being determined only one of the three co-heirs to the barony with only a twenty- five percent interest whereas another claimant, Sir Henry Hunloke, Bt., had a fifty percent interest and was the heir general of the elder of the two sisters from whom the claims were derived.No clear explanation for the award was given by the House of Lords except an inference that Charlotte came from( or at least had married into) a better family.Charlotte legally changed her name by Royal Licence on 6 October of the same year to Charlotte FitzGerald- de Ros.Members of the de Ros family lived in Thames Ditton for a long while.They had links with the brightest of society, from the Duke of Wellington downwards.Henry's younger brother was the notorious Lord Edward FitzGerald.Charlotte died on 9 January 1831.
Knowledge 1: Henry FitzGerald-de Ros, 21st Baron de Ros
Henry William FitzGerald-de Ros, 21st Baron de Ros (12 June 1793 – 28/29 March 1839) was a British nobleman, the son of Lord Henry FitzGerald and his wife Charlotte FitzGerald-de Ros, 20th Baroness de Ros.Fitzgerald-de Ros briefly served as Member of Parliament for the borough of West Looe from 1816 to 1818.In 1831, upon the death of his mother, he inherited the Barony of de Ros, the oldest surviving barony in the Peerage of England.He was an excellent whist player, but was involved in a gambling scandal in 1836.Lord de Ros was accused of cheating at Graham's Club by the trick of "sauter la coupe", and by marking the cards with his thumbnail.He sued his accusers for libel, but lost the case.He died not long after, and was commemorated by Theodore Hook with the punning epitaph, "Here lies the premier baron of England, patiently awaiting the last trump."He died in London, unmarried and without issue. [SEP] Knowledge 2: William FitzGerald-de Ros, 22nd Baron de Ros
William Lennox Lascelles FitzGerald-de Ros, 22nd Baron de Ros of Helmsley, PC, DL (1 September 1797 – 6 January 1874), was a British soldier and Conservative politician.A general in the Army, he also held political office as Captain of the Yeomen of the Guard in 1852 and between 1858 and 1859.

Answer: 30 July 1761