John de Vere, 12th Earl of Oxford
John de Vere, 12th Earl of Oxford (23 April 1408 – 26 February 1462), was the son of Richard de Vere, 11th Earl of Oxford (1385?–15 February 1417), and his second wife, Alice Sergeaux (1386–1452).
A Lancastrian loyalist during the latter part of his life, he was convicted of high treason and beheaded on Tower Hill on 26February 1462.
John de Vere, 16th Earl of Oxford
John de Vere, 16th Earl of Oxford( 1516 – 3 August 1562) was born to John de Vere, 15th Earl of Oxford and Elizabeth Trussell, daughter of Edward Trussell.
He was styled Lord Bolebec 1526 to 1540 before he succeeded to his father's title.
Robert de Vere, 5th Earl of Oxford
Robert de Vere, 5th Earl of Oxford( c. 1220 – 1296) was the son and heir of Hugh de Vere, 4th Earl of Oxford, and chamberlain to Queen Eleanor.
Margery Golding
Margery Golding, Countess of Oxford( c. 1526 – 2 December 1568) was the second wife of John de Vere, 16th Earl of Oxford, the mother of Edward de Vere, 17th Earl of Oxford, and the half- sister of Arthur Golding, the English translator.
Aubrey de Vere, 10th Earl of Oxford
Aubrey de Vere, 10th Earl of Oxford( c. 1338 – 15 February 1400) was the third son of John de Vere, 7th Earl of Oxford and Maud de Badlesmere, daughter of Bartholomew de Badlesmere, 1st Lord Badlesmere.
Aubrey de Vere had three brothers, John, Thomas, and Robert, and three sisters.
Margaret, Maud and Elizabeth.
His eldest brother, John, married the daughter of Hugh Courtenay, Earl of Devon, but died in 1350 in his father's lifetime.
Another brother, Robert, also died in his father's lifetime.
Aubrey de Vere's third brother, Thomas, succeeded his father as 8th Earl of Oxford, and was in turn succeeded by his only son, Robert de Vere, 9th Earl of Oxford, who died in 1392 without issue, leaving Aubrey de Vere to inherit the earldom.
In 1360 Aubrey de Vere was made steward of the royal forest of Havering in Essex.
In 1367 was retained to' abide for life' with the Black Prince, with a substantial allowance.
He was knighted, made constable of Wallingford Castle in 1375 and also given the honours of Wallingford and St. Valery, though he gave up Wallingford in 1378 for Hadleigh Castle.
Edward III used him as an ambassador in seeking peace with France.
In 1381, de Vere became a Chamberlain of the Royal Household and member of the privy council.
In 1388 his nephew, Robert de Vere, Duke of Ireland and 9th Earl of Oxford was deemed a traitor, causing Aubrey to lose his post of chamberlain.
However, after Robert ’s death in 1392, the king gave Aubrey the title of Earl of Oxford allowing him to take a seat in parliament.
Aubrey ’s son, Richard became the 11th Earl of Oxford on his death.
An administrator of Aubrey de Veer appears as William Tasburgh, of Raylegh, parson, in 1401.
John de Vere, 13th Earl of Oxford
John de Vere, 13th Earl of Oxford (8 September 1442 – 10 March 1513), the second son of John de Vere, 12th Earl of Oxford, and Elizabeth Howard, a first cousin of John Howard, 1st Duke of Norfolk - 2nd creation, was one of the principal Lancastrian commanders during the English Wars of the Roses.
He was the principal commander of King Henry VII's army at the Battle of Bosworth Field, and again led Henry's troops to victory at the Battle of Stoke Field two years later.
He became one of the great men of the King's regime.
Margaret de Vere
Margaret de Vere( died 16 June 1398) was an English noblewoman, a daughter of John de Vere, 7th Earl of Oxford and his wife Maud de Badlesmere.
Robert Broughton (MP)
Sir Robert Broughton( died 17 August 1506) was a landowner, soldier, and Member of Parliament for Suffolk.
He was knighted at the Battle of Stoke, where he fought on the Lancastrian side under John de Vere, 13th Earl of Oxford.
He was a close associate of the Earl, and is said to have married the Earl's illegitimate daughter, Katherine.
John de Vere, 7th Earl of Oxford
John de Vere, 7th Earl of Oxford( c. 12 March 1312 – 24 January 1360) was the nephew and heir of Robert de Vere, 6th Earl of Oxford who succeeded as Earl of Oxford in 1331, after his uncle died without issue.
John de Vere was a trusted captain of Edward III in the king's wars in Scotland and France, and took part in both the Battle of Crécy and the Battle of Poitiers.
He died campaigning in France in 1360.
Throughout his career he was closely associated with William de Bohun, 1st Earl of Northampton, who was his brother- in- law.
Elizabeth Trussell, Countess of Oxford
Elizabeth de Vere(" née" Trussell), Countess of Oxford( 1496 – before July 1527) was an English noblewoman.
As a young child she became a royal ward.
She married John de Vere, 15th Earl of Oxford, and by him was mother of the 16th Earl and grandmother of Sir Francis and Sir Horace Vere, the' fighting Veres'.

Question: Who is John De Vere, 13Th Earl Of Oxford's paternal grandmother?
Answer: Alice Sergeaux