Primary Sources

Inquisitions Post Mortem for John Cobham, knight, Writ 14 Jan. 1408.
He died on 10 Jan. last [1408]. Joan wife of Nicholas Hawberk, knight, is his kinswoman and next heir, being the daughter of Joan, his daughter, aged 30 years and more.

Notes

John de Cobham, 3rd Baron Cobham (died 10 January 1408) was the son of John de Cobham, 2nd Baron Cobham and Joan de Beauchamp. He was given a licence to crenellate by Richard II in 1381 and built Cooling Castle at the family seat in Cowling or Cooling, Kent.

Around 1332, Sir John married Margaret Courtenay, daughter of Hugh Courtenay, 2nd Earl of Devon. She died on 2 August 1385 or 95. In 1398 Sir John was exiled to Guernsey. Henry IV restored the estate and Sir John died in Cooling, 1408. He was buried at Grey Friars, London, though his brass is near his wife in the church of St Mary
www.findagrave.com

Sir John Cobham
BIRTH 1320
England
DEATH 10 Jan 1408 (aged 87–88)
Wiltshire, England
BURIAL
St. Mary Magdalene New Churchyard
Cobham, Gravesham Borough, Kent, England
MEMORIAL ID 103325961

Sir John Cobham, Knight, 3rd Lord Cobham, of Colling, Cobham, Beckley in Chalk, Pole in Southfleet, Kent.

Son and heir of John de Cobham and Joan de Beauchamp. Grandson of Henry de Cobham and Maud de Morville.

Husband of Margaret de Courtenay, daughter of Hugh de Courtenay and Margaret de Bohun. They were married about 1342, the date of their marriage grant, and had one daughter, Joan, who would marry Sir John de la Pole.

John was summoned to Parliament as Johanni de Cobham de Kent an d as Johanni de Cobham chivaler. He went on several French expeditions, made Banneret in 1370, founded the college of Cobham in 1362, became the ambassador to Rome in 1367, appointed a Trier of Petitions in Parliament in 1377.
John received a permit to crenellate by Richard II in 1381, and built the Cooling Castle.

In 1388, John was one the Lords Appellant who impeached the King's favorites, Michael de la Pole, Robert de Vere, Earl of Oxford and others. He was impeached at Shrewsbury in Jan 1398, condemned to to hanged as a traitor, but Richard commuted the sentence and banished John to Guerney, Normandy. After King Henry IV's accession to the throne, John returned, and died at Cooling.

He was buried at Cobham, but a cenotaph plague remains at Grey Friars, London.

It is still to be ascertained if the cenotaph is at Cobham or London.

Family Members
Parents
John Cobham
1290–1355
Joan de Beauchamp Cobham

Spouse
Margaret de Courtenay Cobham
unknown–1395

Siblings
Joan de Cobham Despenser
1316–1357

Children
Joan Cobham de la Pole
unknown–1393

Magdalene, Cobham.