Question: Who is John De Mowbray, 4Th Duke Of Norfolk's paternal grandfather?

Knowledge 1: John de Mowbray, 4th Duke of Norfolk
John de Mowbray, 4th Duke of Norfolk, (18 October 144414 January 1476), known as 1st Earl of Surrey between 1451 and 1461, was the only son of John de Mowbray, 3rd Duke of Norfolk and Eleanor Bourchier.His maternal grandparents were William Bourchier, Count of Eu and Anne of Gloucester.In 1451 the earldom of Surrey was revived for him.Mowbray was descended from a sister of the last earl of the previous creation.In 1461 he succeeded his father as 4th Duke of Norfolk and hereditary Earl Marshal.He continued his father's efforts to possess Caister Castle, finally taking it in September 1469 after a siege.John Paston had inherited Caister from John Fastolf in 1459 and was in charge of defending it.Although Paston had been in Mowbray's service for several years, Mowbray showed a notable ruthlessness in his conduct of the siege, in which one Daubenay, a long-standing Paston servant, was killed.Under pressure from the Church, Norfolk did at least grant the other defenders a safe conduct.In 1476, within a day of Norfolk's death, the Paston family took Caister back again.Norfolk was invested as a Knight of the Garter in 1472.He died very suddenly, having apparently been in good health the day before.He married Elizabeth Talbot, daughter of John Talbot, 1st Earl of Shrewsbury and his second wife Lady Margaret Beauchamp.They had only one child, Anne de Mowbray, 8th Countess of Norfolk, and sothe 1397 creation of the dukedom became extinct upon his death.Anne, who was only 3 years old when her father died, inherited the earldom and his extensive lands and wealth.The dukedom would be recreated in 1481 and again in 1483.The 1483 creation survives to the present day, despite two periods of forfeiture. [SEP] Knowledge 2: John Mowbray, 3rd Duke of Norfolk
John Mowbray, 3rd Duke of Norfolk, KG, Earl Marshal (12 September 14156 November 1461) was a fifteenth-century English magnate who, despite having a relatively short political career, played a significant role in the early years of the Wars of the Roses.Mowbray was born in 1415, the only son and heir of John de Mowbray, 2nd Duke of Norfolk, and Katherine Neville.He inherited his titles upon his father's death in 1432.As a minor he became a ward of King Henry VI and was placed under the protection of Humphrey, Duke of Gloucester, alongside whom Mowbray would later campaign in France.He seems to have had an unruly and rebellious youth.Although the details of his misconducts are unknown, they were severe enough for the King to place strictures upon him and separate him from his followers.Mowbray's early career was spent in the military, where he held the wartime office of Earl Marshal.Later he led the defence of England's possessions in Normandy during the Hundred Years' War.He fought in Calais in 1436, and during 1437–38 served as warden of the east march on the Anglo-Scottish border, before returning to Calais.Mowbray's marriage to Eleanor Bourchier in the early 1430s drew him into the highly partisan and complex politics of East Anglia, and he became the bitter rival of William de la Pole, Earl (later Duke) of Suffolk.Mowbray prosecuted his feuds with vigour, often taking the law into his own hands.This often violent approach drew the disapproving attention of the Crown, and he was bound over for massive sums and imprisoned twice in the Tower of London.His enemies, particularly de la Pole, also resorted to violent tactics.As a result, local gentry looked to Mowbray for leadership, but often in vain; De la Pole was a powerful local force and favourite of the King, while Mowbray was neither.As law and order collapsed in eastern England, national politics became increasingly factional, with popular revolts against the King's councillors.Richard, Duke of York, who by the 1450s felt excluded from government, grew belligerent.He rebelled twice, and both times Mowbray defended King Henry.Eventually Mowbray drifted towards York, with whom he shared an enmity towards de la Pole.For much of the decade, Mowbray was able to evade direct involvement in the fractious political climate, and aligned with York early in 1460 until York's death later that year.In April 1461, Mowbray was instrumental in Edward's victory at the Battle of Towton, bringing reinforcements late in the combat.He was rewarded by the new regime but did not live to enjoy it.He died in November 1461, and was succeeded as Duke of Norfolk by his only son, John.
Knowledge 1: John Mowbray, 3rd Duke of Norfolk
John Mowbray, 3rd Duke of Norfolk, KG, Earl Marshal (12 September 14156 November 1461) was a fifteenth-century English magnate who, despite having a relatively short political career, played a significant role in the early years of the Wars of the Roses.Mowbray was born in 1415, the only son and heir of John de Mowbray, 2nd Duke of Norfolk, and Katherine Neville.He inherited his titles upon his father's death in 1432.As a minor he became a ward of King Henry VI and was placed under the protection of Humphrey, Duke of Gloucester, alongside whom Mowbray would later campaign in France.He seems to have had an unruly and rebellious youth.Although the details of his misconducts are unknown, they were severe enough for the King to place strictures upon him and separate him from his followers.Mowbray's early career was spent in the military, where he held the wartime office of Earl Marshal.Later he led the defence of England's possessions in Normandy during the Hundred Years' War.He fought in Calais in 1436, and during 1437–38 served as warden of the east march on the Anglo-Scottish border, before returning to Calais.Mowbray's marriage to Eleanor Bourchier in the early 1430s drew him into the highly partisan and complex politics of East Anglia, and he became the bitter rival of William de la Pole, Earl (later Duke) of Suffolk.Mowbray prosecuted his feuds with vigour, often taking the law into his own hands.This often violent approach drew the disapproving attention of the Crown, and he was bound over for massive sums and imprisoned twice in the Tower of London.His enemies, particularly de la Pole, also resorted to violent tactics.As a result, local gentry looked to Mowbray for leadership, but often in vain; De la Pole was a powerful local force and favourite of the King, while Mowbray was neither.As law and order collapsed in eastern England, national politics became increasingly factional, with popular revolts against the King's councillors.Richard, Duke of York, who by the 1450s felt excluded from government, grew belligerent.He rebelled twice, and both times Mowbray defended King Henry.Eventually Mowbray drifted towards York, with whom he shared an enmity towards de la Pole.For much of the decade, Mowbray was able to evade direct involvement in the fractious political climate, and aligned with York early in 1460 until York's death later that year.In April 1461, Mowbray was instrumental in Edward's victory at the Battle of Towton, bringing reinforcements late in the combat.He was rewarded by the new regime but did not live to enjoy it.He died in November 1461, and was succeeded as Duke of Norfolk by his only son, John. [SEP] Knowledge 2: Roger de Mowbray, 1st Baron Mowbray
Roger de Mowbray, 1st Baron Mowbray (1254 – 21 November 1297), was an English peer and soldier.The son of another Roger de Mowbray, and grandson of William de Mowbray, he served in the Welsh and Gascon Wars.He was summoned to the Parliament of Simon de Montfort in 1265, but such summonses have later been declared void.However, in 1283 he was summoned to Parliament by King Edward I as Lord Mowbray.De Mowbray married Rose, a daughter of Richard de Clare, 6th Earl of Gloucester.They had at least two children:
Roger de Mowbray was buried in Fountains Abbey.
Knowledge 1: John de Mowbray, 4th Duke of Norfolk
John de Mowbray, 4th Duke of Norfolk, (18 October 144414 January 1476), known as 1st Earl of Surrey between 1451 and 1461, was the only son of John de Mowbray, 3rd Duke of Norfolk and Eleanor Bourchier.His maternal grandparents were William Bourchier, Count of Eu and Anne of Gloucester.In 1451 the earldom of Surrey was revived for him.Mowbray was descended from a sister of the last earl of the previous creation.In 1461 he succeeded his father as 4th Duke of Norfolk and hereditary Earl Marshal.He continued his father's efforts to possess Caister Castle, finally taking it in September 1469 after a siege.John Paston had inherited Caister from John Fastolf in 1459 and was in charge of defending it.Although Paston had been in Mowbray's service for several years, Mowbray showed a notable ruthlessness in his conduct of the siege, in which one Daubenay, a long-standing Paston servant, was killed.Under pressure from the Church, Norfolk did at least grant the other defenders a safe conduct.In 1476, within a day of Norfolk's death, the Paston family took Caister back again.Norfolk was invested as a Knight of the Garter in 1472.He died very suddenly, having apparently been in good health the day before.He married Elizabeth Talbot, daughter of John Talbot, 1st Earl of Shrewsbury and his second wife Lady Margaret Beauchamp.They had only one child, Anne de Mowbray, 8th Countess of Norfolk, and sothe 1397 creation of the dukedom became extinct upon his death.Anne, who was only 3 years old when her father died, inherited the earldom and his extensive lands and wealth.The dukedom would be recreated in 1481 and again in 1483.The 1483 creation survives to the present day, despite two periods of forfeiture. [SEP] Knowledge 2: Roger de Mowbray, 1st Baron Mowbray
Roger de Mowbray, 1st Baron Mowbray (1254 – 21 November 1297), was an English peer and soldier.The son of another Roger de Mowbray, and grandson of William de Mowbray, he served in the Welsh and Gascon Wars.He was summoned to the Parliament of Simon de Montfort in 1265, but such summonses have later been declared void.However, in 1283 he was summoned to Parliament by King Edward I as Lord Mowbray.De Mowbray married Rose, a daughter of Richard de Clare, 6th Earl of Gloucester.They had at least two children:
Roger de Mowbray was buried in Fountains Abbey.

Answer: John de Mowbray, 2nd Duke of Norfolk