of Heton, Islandshire in Northumberland, married a certain Agnes, a lady of unrecorded parentage. He fought in many battles for the English king on the Marches of the Scottish borders. He was succeeded by his son:
Sir Thomas Grey ), the chronicler, who married Margaret de Pressene, a daughter William de Pressene, of Presson, Northumberland. Sir Thomas fought in many battles, besieged castles, and recorded the events he witnessed in a celebrated historical account of the campaigns known as Scalacronica, published in 1369. He died leaving a son Sir Thomas Grey, aged ten.
Between 1408 and 1413 Henry V granted Grey three annuities, and on 8 August 1415 gave him the forfeited estates of his brother, Sir Thomas Grey, executed for his part in the Southampton Plot. Grey fought at Agincourt in 1415. On 1 August 1417 Henry V launched his second invasion of Normandy, and in that year Grey was Captain of Mortagne in October 1417, and was with the King at the siege of Caen, where his valiant conduct caused the King to name him a Knight of the Garter. Henry V granted the castle and seigneurie of Tilly in Normandy in November 1417, recently forfeited by Sir William Harcourt, a supporter of the King's enemies. Grey was subsequently sent with a guard to Powys to bring the recently captured Lollard leader, Sir John Oldcastle, before Parliament. , Normandy. In 1419 John Grey was granted the comté of Tancarville In 1419 he was again in France as Captain of Mantes, and on 31 January 1419 was granted the comté of Tancarville in Normandy to hold by grand sergeanty of delivery of a bascinet helmet at the Castle of Roan on Saint George's Day each year. Grey's continued service in the French wars earned him further grants, and he was made governor of the Castle of Tournay. In 1418 or on 31 January 1419 he was created a Knight of the Garter. In 1420 he was Captain of Harfleur, and by that date was one of the leading landowners in Normandy. On 22 March 1420/1, while fording a river near the Chateau de Beaufort at the Battle of Baugé, Grey, Thomas of Lancaster, 1st Duke of Clarence, and many other of the English nobility were slain by a Franco-Scottish force, having incautiously engaged the enemy without proper preparation and with no archers in support.
Henry Grey, 2nd Earl of Tankerville, Henry Grey was knighted in 1426 and married Antigone in France, the illegitimate daughter of Humphrey, Duke of Gloucester. During the 1430s and 1440s the French KingsCharles VI and the dauphin, Philip regained much of the territory lost to the Valois monarchy. Having lost his lands and fortune at Tancarville, the Count died on about 13 Jan 1449/50. His title became extinct.