Question: When did Edmund Grey, 1St Earl Of Kent's father die?

Knowledge 1: Edmund Grey, 1st Earl of Kent
Edmund Grey, 1st Earl of Kent (26 October 141622 May 1490), English administrator, nobleman and magnate, was the son of Sir John Grey, KG and Constance Holland.His main residence was at Wrest near Silsoe, Bedfordshire. [SEP] Knowledge 2: John Grey (knight)
Sir John Grey (c. 1387 – 27 August 1439), English nobleman and soldier, of Ruthin, Denbighshire, Wales, Badmondisfield (in Wickhambrook), Suffolk, Great Gaddesden, Hertfordshire, etc., second but eldest surviving son and heir apparent of Sir Reginald Grey, 3rd Baron Grey de Ruthyn by his 1st wife, Margaret Roos.He was also Captain of Gournay.He traveled with the king to France in 1415 and 1417.He fought at the Battle of Agincourt and was invested as the 151st Knight of the Garter on 5 May 1436.He married (first) before Trinity term 1410(as her second husband)Constance Holland (c.1387–14November 1437), the daughter of John Holland, 1st Duke of Exeter(half brother of King Richard II), by his wife, Elizabeth of Lancaster.By her mother, Constance was a niece of King Henry IV.Constance married (first) before 1 June 1402 (by papal dispensation dated 18 Sept. 1391, they being related in the fourth degree of kindred)Sir Thomas Mowbray, 4th Earl of Norfolk, Earl of Nottingham, Earl Marshal, Lord Mowbray, Segrave, and Gower.They had no issue.Sir Thomas Mowbray was executed 8 June 1405 due to his revolt against her uncle, King Henry IV.Sir John Grey and Constance Holland had three children:Constance, Countess Marshal, died 12 (or 14)Nov. 1437, and was buried in a chapel at St. Katherine by the Tower, London by her brother, John Holland, Duke of Exeter.Following her death, Sir John Grey married (2nd) before 1 July 1438 Margaret Mowbray, daughter of Thomas Mowbray, 1st Duke of Norfolk and widow of Sir Robert Howard.They had no issue.Sir John Grey died 27 August 1439.His widow, Margaret, received a papal indult for a portable altar 3 August 1446.She died shortly before 18 October 1459.
Knowledge 1: Edmund Grey, 1st Earl of Kent
Edmund Grey, 1st Earl of Kent (26 October 141622 May 1490), English administrator, nobleman and magnate, was the son of Sir John Grey, KG and Constance Holland.His main residence was at Wrest near Silsoe, Bedfordshire. [SEP] Knowledge 2: Anthony Grey, 9th Earl of Kent
Rev. Anthony Grey (1557 – 9 November 1643) was Earl of Kent from 1639 to his death.He was a son of George Gray by Margery, daughter of Gerard Salvaine of Croxdale.George was the apparently only son of Anthony Gray of Brancepeth, a son of George Grey, 2nd Earl of Kent, by his second wife Katherine (or Katharine or Catherine), daughter of William Herbert, 1st Earl of Pembroke.In 1639, Gray succeeded his childless second cousin once removed Henry Grey, 8th Earl of Kent.Henry was a great-grandson of Henry Grey, 4th Earl of Kent, another son of the 2nd Earl.A priest in the Church of England, Gray was rector at Aston Flamville and later Burbage.
Knowledge 1: John Grey (knight)
Sir John Grey (c. 1387 – 27 August 1439), English nobleman and soldier, of Ruthin, Denbighshire, Wales, Badmondisfield (in Wickhambrook), Suffolk, Great Gaddesden, Hertfordshire, etc., second but eldest surviving son and heir apparent of Sir Reginald Grey, 3rd Baron Grey de Ruthyn by his 1st wife, Margaret Roos.He was also Captain of Gournay.He traveled with the king to France in 1415 and 1417.He fought at the Battle of Agincourt and was invested as the 151st Knight of the Garter on 5 May 1436.He married (first) before Trinity term 1410(as her second husband)Constance Holland (c.1387–14November 1437), the daughter of John Holland, 1st Duke of Exeter(half brother of King Richard II), by his wife, Elizabeth of Lancaster.By her mother, Constance was a niece of King Henry IV.Constance married (first) before 1 June 1402 (by papal dispensation dated 18 Sept. 1391, they being related in the fourth degree of kindred)Sir Thomas Mowbray, 4th Earl of Norfolk, Earl of Nottingham, Earl Marshal, Lord Mowbray, Segrave, and Gower.They had no issue.Sir Thomas Mowbray was executed 8 June 1405 due to his revolt against her uncle, King Henry IV.Sir John Grey and Constance Holland had three children:Constance, Countess Marshal, died 12 (or 14)Nov. 1437, and was buried in a chapel at St. Katherine by the Tower, London by her brother, John Holland, Duke of Exeter.Following her death, Sir John Grey married (2nd) before 1 July 1438 Margaret Mowbray, daughter of Thomas Mowbray, 1st Duke of Norfolk and widow of Sir Robert Howard.They had no issue.Sir John Grey died 27 August 1439.His widow, Margaret, received a papal indult for a portable altar 3 August 1446.She died shortly before 18 October 1459. [SEP] Knowledge 2: Anthony Grey, 9th Earl of Kent
Rev. Anthony Grey (1557 – 9 November 1643) was Earl of Kent from 1639 to his death.He was a son of George Gray by Margery, daughter of Gerard Salvaine of Croxdale.George was the apparently only son of Anthony Gray of Brancepeth, a son of George Grey, 2nd Earl of Kent, by his second wife Katherine (or Katharine or Catherine), daughter of William Herbert, 1st Earl of Pembroke.In 1639, Gray succeeded his childless second cousin once removed Henry Grey, 8th Earl of Kent.Henry was a great-grandson of Henry Grey, 4th Earl of Kent, another son of the 2nd Earl.A priest in the Church of England, Gray was rector at Aston Flamville and later Burbage.

Answer: 1439