Sir John de Grey, 1st Baron of Rotherfield

According to the National Trust (about Greys Court)...

In the early 13th century the estate belonged to Walter de Grey, Archbishop of York. But it was his nephew, the 1st Baron de Grey, John, who was responsible for fortifying the mansion and surrounding buildings.

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John was summoned to Parliament as first Baron Grey of Rotherfield on 26 Jan 1297. He took part in the Scottish wars under Edward I "Longshanks" and fought in the glorious victory at Falkirk in 1298 against William Wallace, when a large part of Edward's troops refused to fight. He was back in Scotland again in 1306 after the rebellion and enthronement of Robert Bruce

src: tudorplace.com.ar/Grey1.htm

https://www.familysearch.org/tree/person/details/LBBR-VR4

Sir Robert de Grey's son, John de Grey (1271-1312), was summoned to Parliament as first Baron Grey of Rotherfield on 26th January 1297. He took part in the Scottish wars under Longshanks and fought in the glorious victory at Falkirk in 1298 against William Wallace, when a large part of Edward's troops refused to fight. He was back in Scotland again in 1306 after the rebellion and enthronement of Robert Bruce. He died in 1312 having married Margaret, daughter of William de Odingsells of Maxstoke, Warwickshire and was succeeded by his son, John de Grey, second Baron Grey of Rotherfield (1300-1359). John de Grey was probably the most famous of the de Greys of Rotherfield. He was a professional soldier who:
www.findagrave.com

Sir John De Grey III
BIRTH 1271
Oxfordshire, England
DEATH 17 Oct 1311 (aged 39–40)
Oxfordshire, England
BURIAL
St Mary Churchyard
Cogges, West Oxfordshire District, Oxfordshire, England
MEMORIAL ID 147339260

Lord Grey of Rotherfield

Sir Robert de Grey's son, John de Grey (1271-1312), was summoned to Parliament as first Baron Grey of Rotherfield on 26th January 1297. He took part in the Scottish wars under Longshanks and fought in the glorious victory at Falkirk in 1298 against William Wallace, when a large part of Edward's troops refused to fight. He was back in Scotland again in 1306 after the rebellion and enthronement of Robert Bruce. He died in 1312 having married Margaret, daughter of William de Odingsells of Maxstoke, Warwickshire and was succeeded by his son, John de Grey, second Baron Grey of Rotherfield (1300-1359). John de Grey was probably the most famous of the de Greys of Rotherfield. He was a professional soldier who:

'Received livery of his lands in the fifteenth year of the reign of Edward the second after the conquest'

Family Members
Parents
Robert De Grey
1245–1295

Joan De Valoines Grey
1245–1312

Spouse
Margaret Oddingseles Moreby
1277–1330

Children
John de Grey
1300–1359
'Received livery of his lands in the fifteenth year of the reign of Edward the second after the conquest