Edward Plunkett, 4th Baron of Dunsany
Edward Plunkett, 4th Baron of Dunsany( died 1521) was an Anglo- Irish nobleman: he was killed in battle during the Irish Rebellion of 1520- 1.
Christopher Plunkett, 1st Baron of Dunsany
Christopher Plunkett, 1st Baron of Dunsany (c. 1410 – c. 1463) was an Irish peer.
He was the second son of Sir Christopher Plunkett, 1st Baron Killeen.
The elder Christopher Plunkett (Baron Killeen) of Rathregan had married in 1399, Lady Joan de Cusack, heiress of Killeen and Dunsany; she was the daughter of Sir Lucas de Cusack, Lord of Killeen.
Sir Christopher and Lady Joan's two oldest children were male.
John, the elder, inherited Killeen Castle, Dunsany and Christopher, the younger, inherited Dunsany Castle and Demesne.
A charter of 1439, a few years before his father's death, refers to the younger Sir Christopher as lord of the manor of Dunsany.
("Dns. de Dunsany").
He is referred to by William Camden, in the next century, as being the first Baron of Dunsany, that is: an hereditary member of the Irish House of Lords.
What year he became a peer is uncertain.
The first reference to the Dunsanys as peers is in the roll of the two Irish earls and eleven Irish barons who met with Henry VII of England and Ireland at Greenwich in 1489; the third Lord Dunsany, Sir Christopher's grandson, is listed last of the eleven, after Lord Trimleston; other Irish parliaments use almost the same order of precedence.
It so happens that we know the date of the patent of the Barony of Trimleston to be 4 March 1462; it is one of two baronial patents that survive.
Cokayne concludes, in the "Complete Peerage", that, if this precedence represents the date of creation, then, since Sir Christopher's will is dated 1 August 1462, probably shortly before his death, the Barony of Dunsany was created in that year.
The Complete Peerage also notes, however, that the order of precedence was likely to reflect the relative importance of the lords, rather than the age of their titles.
Debrett's single sourceless sentence on the subject describes the charter of 1439 as a writ, although Cokayne denies that Ireland recognised the creation of peerages by writ; some websites have copied Debrett.
Christopher Plunkett was succeeded by his son Richard Plunkett, 2nd Baron of Dunsany.
Randal Plunkett, 21st Baron of Dunsany
Randal Plunkett, 21st Baron of Dunsany( born 9 March 1983), is an Irish film director and producer, as well as a landowner and holder of one of the oldest surviving Irish peerage titles, and one of the longest- inhabited houses in Ireland.
Randal Plunkett, 19th Baron of Dunsany
Randal Arthur Henry Plunkett, 19th Baron of Dunsany (25 August 1906 – 8 February 1999) was an Irish peer.
An only child, he was the son of author and playwright Edward Plunkett, 18th Baron of Dunsany and Lady Beatrice Child Villiers, daughter of Victor Child Villiers, 7th Earl of Jersey.
Aimée de Heeren
Aimée de Heeren, born Aimée Soto- Maior de Sá or Aimée de Sotomayor( 3 August 1903 – 13 September 2006) was a Brazilian socialite.
She was named to the International Best Dressed List Hall of Fame in 1996.
She was the sister of Vera de Sa Sottomaior, who had been married to John Felix Charles" Ivor" Bryce, Randal Plunkett, 19th Baron of Dunsany and Sir Walter Frederic Pretyman.
Through her sister, she is the aunt of the 20th Lord Dunsany.
David Seyfried-Herbert, 19th Baron Herbert
David John Seyfried- Herbert, 19th Baron Herbert( born 3 March 1952) is a British peer.
Ryder Burton
Admiral James Ryder Burton, KH( 1795 -– 2 August 1876) was a British Royal Navy officer.
He was the son of Edmund Burton, the Dean of Killala.
He progressed on the Reserved List to the rank of Admiral on 14 November 1863.
In 1823, he married Anne Maria Plunkett, the widow of Philip Roche of Dublin, who was the youngest daughter of Randal Plunkett, 13th Baron of Dunsany( 1739 – 1821).
He was believed by some to be an heir to a old baronetcy in the Baronetage of England that was possibly dormant, but he did not pursue inheriting it.
John Plunkett, 17th Baron of Dunsany
John William Plunkett, 17th Baron of Dunsany( 31 August 1853 – 16 January 1899) was an Anglo- Irish Conservative politician and peer.
Edward Plunkett, 20th Baron of Dunsany
Edward John Carlos Plunkett, 20th Baron of Dunsany( born Dublin 10 September 1939 — died Navan, County Meath, 24 May 2011), with Irish, Brazilian and UK citizenship, was the grandson of the author Lord Dunsany, and a modern artist and property owner.
Lord Dunsany succeeded to the title in 1999 on the death of his father, Lt- Col Randal Arthur Henry Plunkett, 19th Baron of Dunsany.
Edward Plunkett, 18th Baron of Dunsany
Edward John Moreton Drax Plunkett, 18th Baron of Dunsany (24 July 1878 – 25 October 1957), was an Anglo-Irish writer and dramatist; his work, mostly in the fantasy genre, was published under the name Lord Dunsany.
More than ninety books of his work were published in his lifetime, and both original work and compilations have continued to appear.
Dunsany's œuvre includes many hundreds of published short stories, as well as plays, novels and essays.
He achieved great fame and success with his early short stories and plays, and during the 1910s was considered one of the greatest living writers of the English-speaking world; he is today best known for his 1924 fantasy novel "The King of Elfland's Daughter".
He was the inventor of an asymmetric version of chess called Dunsany's Chess.
Born and raised in London, to the second-oldest title (created 1439) in the Irish peerage, Dunsany lived much of his life at what may be Ireland's longest-inhabited house, Dunsany Castle near Tara, worked with W. B. Yeats and Lady Gregory, received an honorary doctorate from Trinity College, Dublin, was chess and pistol-shooting champion of Ireland, and travelled and hunted extensively.
He died in Dublin after an attack of appendicitis.

Question: When did Randal Plunkett, 19Th Baron Of Dunsany's father die?
Answer: 25 October 1957