Joan Fitzalan, Countess of Hereford
Joan FitzAlan, Countess of Hereford, Countess of Essex and Countess of Northampton( 1347 – 7 April 1419) was the wife of the 7th Earl of Hereford, 6th Earl of Essex and 2nd Earl of Northampton.
She was the mother of Mary de Bohun, the first wife of Henry of Bolingbroke who later reigned as King Henry IV, and Eleanor de Bohun, Duchess of Gloucester.
She was the maternal grandmother of King Henry V.
In 1400, she gave the order for the beheading of the Earl of Huntingdon in revenge for the part he had played in the execution of her brother, the 11th Earl of Arundel.
The estates which comprised Joan's large dowry made her one of the principal landowners in Essex, where she exercised lordship, acting as arbitrator and feoffee in property transactions.
Eleanor de Bohun
Lady Eleanor de Bohun( – 3 October 1399) was the elder daughter and co-heiress with her sister, Mary de Bohun, of their father Humphrey de Bohun, 7th Earl of Hereford( 1341 – 1373).
Her mother was Lady Joan Fitzalan, daughter of Richard FitzAlan, 10th Earl of Arundel and his second wife Eleanor of Lancaster.
Humphrey de Bohun, 2nd Earl of Hereford
Humphrey( IV) de Bohun( 1204 – 24 September 1275) was 2nd Earl of Hereford and 1st Earl of Essex, as well as Constable of England.
He was the son of Henry de Bohun, 1st Earl of Hereford, and Maud FitzGeoffrey.
Henry de Bohun, 1st Earl of Hereford
Henry de Bohun, 1st Earl of Hereford( 1176 – 1 June 1220) was an Anglo- Norman nobleman.
He was Earl of Hereford and Hereditary Constable of England from 1199 to 1220.
Eleanor de Braose
Eleanor de Braose( c. 1228–1251) was a Cambro- Norman noblewoman in Great Britain, and a wealthy co-heiress of her father, who was the powerful Marcher lord William de Braose, and of her mother, Eva Marshal, a co-heiress of the Earls of Pembroke.
Her husband was Humphrey de Bohun, heir of the 2nd Earl of Hereford, by whom she had children, including Humphrey de Bohun, 3rd Earl of Hereford.
Elizabeth of Rhuddlan
Elizabeth of Rhuddlan (7 August 1282 – 5 May 1316) was the eighth and youngest daughter of King Edward I and Queen Eleanor of Castile.
Of all of her siblings, she was closest to her younger brother King Edward II, as they were only two years apart in age.
Humphrey de Bohun, 6th Earl of Hereford
Humphrey( VIII) de Bohun, 6th Earl of Hereford, 5th Earl of Essex( 6 December 1309 – 15 October 1361) was a Lord High Constable of England.
He distinguished himself as a captain in the Breton campaigns of the Hundred Years' War, winning the victories of Morlaix( 1342) and La Roche- Derrien( 1347).
Henry de Bohun
Sir Henry de Bohun( died 23 June 1314) was an English knight, the grandson of Humphrey de Bohun, 2nd Earl of Hereford.
He was killed on the first day of the Battle of Bannockburn by Robert the Bruce.
Riding in the vanguard of heavy cavalry, de Bohun caught sight of the Scottish king who was mounted on a small palfrey"( ane gay palfray Li till and joly)" armed only with a battle- axe.
De Bohun lowered his lance and charged, but Bruce stood his ground.
At the last moment Bruce manoeuvred his mount nimbly to one side, stood up in his stirrups and hit de Bohun so hard with his axe that he split his helmet and head in two.
Despite the great risk the King had taken, he merely expressed regret that he had broken the shaft of his favourite axe.
An iconic description and picture of the death of Henry de Bohun is contained in" Scotland's Story" by H. E. Marshall.
Humphrey de Bohun, 7th Earl of Hereford
Humphrey de Bohun, 7th Earl of Hereford, 6th Earl of Essex, 2nd Earl of Northampton, KG( 25 March 1341 – 16 January 1373) was the son of William de Bohun, 1st Earl of Northampton and Elizabeth de Badlesmere, and grandson of Humphrey de Bohun, 4th Earl of Hereford by Elizabeth of Rhuddlan, daughter of King Edward I.
He became heir to the Earldom of Hereford after the death of his childless uncle Humphrey de Bohun, 6th Earl of Hereford.
Following King Peter
I's visit to England, Humphrey participated in the sack of Alexandria in 1365.
His wife and the mother of his daughters was Joan Fitzalan, daughter of Richard Fitzalan, 10th Earl of Arundel and Eleanor of Lancaster, whom he married after 9 September 1359.
On his death, his great estates were divided between his two surviving daughters:
John de Bohun, 5th Earl of Hereford
John de Bohun, 5th Earl of Hereford (23 November 1306 – 20 January 1336) was born in St Clement's, Oxford to Humphrey de Bohun, 4th Earl of Hereford and Elizabeth of Rhuddlan, a daughter of Edward
I of England.
After his father's death at the Battle of Boroughbridge, the family lands were forfeited.
It was not until after the fall of the Despensers that John was permitted to succeed to his inherited position as Earl of Hereford and Essex, hereditary Constable of England, and Lord of Brecknock.

Question: When is John De Bohun, 5Th Earl Of Hereford's mother's birthday?
Answer: 7 August 1282