John FitzGerald, 4th Earl of Desmond
John FitzGerald, 4th Earl of Desmond( died 1399) was the son of Gerald FitzGerald, 3rd Earl of Desmond.
He married and had one son, Thomas, who succeeded him as Earl of Desmond.
According to Burke, John FitzGerald married Joan Roche, the daughter of Lord Fermoy.
In March 1399 FitzGerald drowned at Ardfinnan on the River Suir, and was buried at Youghal.
He was succeeded by his son Thomas FitzJohn FitzGerald, 5th Earl of Desmond.
William Feilding, 3rd Earl of Denbigh
William Feilding, 3rd Earl of Denbigh, 2nd Earl of Desmond( 29 December 1640 – 23 August 1685) was an aristocrat in the Peerage of England.
He was the son of George Feilding, 1st Earl of Desmond, and his wife, the former Bridget Stanhope, daughter of Sir Michael Stanhope.
Feilding inherited the title of Earl of Denbigh from his paternal uncle Basil Feilding, 2nd Earl of Denbigh, who died without heirs in 1675.
He married, firstly, Mary King( died 1669), daughter of Sir Robert King and Frances Folliott.
Secondly, he married Lady Mary Carey, daughter of Henry Carey, 2nd Earl of Monmouth.
He died on 23 August 1685 at age 44.
By his first wife, Mary King, Feilding had the following children:
There were no children from the earl's second marriage.
William Feilding, 1st Earl of Denbigh
Admiral William Feilding, 1st Earl of Denbigh (c. 1587 – 8 April 1643, Cannock) was an English naval officer and courtier.
George Feilding, 1st Earl of Desmond
George Feilding, 1st Earl of Desmond (c. 1614 – 31 January 1665) was an Irish peer and the second son of William Feilding, 1st Earl of Denbigh, and his wife, the former Susan Villiers.
Lord Desmond married Bridget Stanhope, who was the daughter of Sir Michael Stanhope and a sister-in-law of George Berkeley, 8th Baron Berkeley.
The couple had several children:
Maurice FitzGerald, 9th Earl of Desmond
Maurice FitzGerald, 9th Earl of Desmond( died 1520) was the brother of James FitzGerald, 8th Earl of Desmond.
John FitzGerald, de facto 12th Earl of Desmond
John FitzGerald, de facto 12th Earl of Desmond( died December 1536) was the brother of Thomas FitzGerald, 11th Earl of Desmond.
Upon his brother's death in 1534, John disputed the title to the earldom of his brother's grandson, James FitzGerald, de jure 12th Earl of Desmond.
According to the" Annals of the Four Masters", John FitzThomas FitzGerald was believed to have instigated the murder of his older brother, James FitzGerald, 8th Earl of Desmond in 1487, and had been expelled by his brother Maurice FitzGerald, 9th Earl of Desmond.
< ref>[ https://books.google.com/books?id=DdhC3eVIdHgC&pg=PA530&dq=James+FitzGerald,+8th+Earl+of+Desmond&hl=en&sa=X&ved=0ahUKEwjDkbTshJjZAhVPrVkKHVoGDLc4FBDoAQg_MAQ#v=onepage&q=
James FitzGerald, 8th Earl of Desmond&f= false Connellan, Owen.
" The Annals of Ireland[ from A.D. 1171 to A.D. 1616", Dublin.
Brian Geraghty, 1846, p. 309]
Gerald FitzGerald, 3rd Earl of Desmond
Gerald FitzMaurice FitzGerald( 1335 – 1398), also known by the Irish Gaelic" Gearóid Iarla"( Earl Gerald), was the 3rd Earl of Desmond, in southwestern Ireland, under the first creation of that title, and a member of the Hiberno- Norman dynasty of the FitzGerald, or Geraldines.
He was the son of Maurice FitzGerald, 1st Earl of Desmond, by his third wife Aveline( Eleanor), daughter of Nicholas FitzMaurice, 3rd Lord of Kerry.
He was half- brother to Maurice FitzGerald, 2nd Earl of Desmond.
Maurice Fitzgerald, 2nd Earl of Desmond, would have been followed by Gerald's older brother, Nicholas, but Nicholas was described as" an idiot", and so was passed over for the earldom.
Because of this, some older histories list Gerald as the 4th Earl.
Maurice FitzGerald, 2nd Earl of Desmond
Maurice FitzMaurice FitzGerald, 2nd Earl of Desmond( d. 1358)( Maurice Óg) was the son of Maurice FitzGerald, 1st Earl of Desmond, and his first wife, Catherine de Burgh.
( Some sources list her as Margaret.)
The 2nd Earl married Beatrice de Stafford, daughter of Ralph de Stafford, 1st Earl of Stafford and Margaret Audley, but died without any male issue, and was therefore succeeded in the Earldom of Desmond by his half- brother Gerald FitzGerald, 3rd Earl of Desmond.
FitzGerald's widow married
Thomas de Ros, 4th Baron de Ros around a year after FitzGerald's death.
James FitzGerald, 6th Earl of Desmond
James FitzGerald, 6th Earl of Desmond( d. 1462), called' the Usurper', was the youngest son of Gerald FitzGerald, 3rd Earl of Desmond, and Lady Eleanor, daughter of James Butler, 2nd Earl of Ormond.
James FitzGerald, 1st Earl of Desmond
James FitzGerald( c. 1570 – November 1601), an Irish nobleman, was the successor of Gerald FitzGerald, 15th Earl of Desmond.
He assumed the title of Earl of Desmond, which had been suppressed in 1582 after the Desmond Rebellions.
He spent much of his life in captivity, and was temporarily, but unsuccessfully, restored to the earldom in 1600 – 01 by the English in an attempt to pacify Munster during the Nine Years War.
He thus became the 1st Earl of Desmond, but soon returned to England, where he died in obscurity.

Question: What is the date of death of George Feilding, 1St Earl Of Desmond's father?
Answer: 8 April 1643