On 25 Oct 1221 [his grandfather] Robert de Vere 3rd Earl of Oxford (age 56) died at Hatfield Regis aka Broad Oak Priory [Map]. His son [his father] Hugh de Vere 4th Earl of Oxford 1208-1263 (age 13) succeeded 4th Earl of Oxford.
In or before 1240 [his father] Hugh de Vere 4th Earl of Oxford 1208-1263 (age 32) and [his mother] Hawise Quincy Countess Oxford were married. She by marriage Countess of Oxford. She the daughter of Saer Quincy 1st Earl Winchester 1170-1219 and Margaret Beaumont Countess Winchester. He the son of Robert de Vere 3rd Earl of Oxford and (age 65).
Around 1240 Robert de Vere 5th Earl of Oxford was born to Hugh de Vere 4th Earl of Oxford 1208-1263 (age 32) and Hawise Quincy Countess Oxford.
Before 22 Feb 1252 Robert de Vere 5th Earl of Oxford (age 12) and were married. She by marriage Countess of Oxford. He the son of Hugh de Vere 4th Earl of Oxford 1208-1263 (age 44) and Hawise Quincy Countess Oxford.
On 24 Jun 1257 [his son] Robert de Vere 6th Earl of Oxford 1257-1331 was born to Robert de Vere 5th Earl of Oxford (age 17) and [his wife] .
In Dec 1263 [his father] Hugh de Vere 4th Earl of Oxford 1208-1263 (age 55) died. He was buried at Earls Colne [Map]. His son Robert de Vere 5th Earl of Oxford (age 23) succeeded 5th Earl of Oxford.
Before 1282 [his son] Robert de Vere 6th Earl of Oxford 1257-1331 (age 24) and [his daughter-in-law] Margaret Mortimer Countess of Oxford -1297 were married. She by marriage Countess of Oxford. He the son of Robert de Vere 5th Earl of Oxford 1240-1296 (age 41) and . She a great x 2 granddaughter of King John "Lackland" of England. 
In 1296 Robert de Vere 5th Earl of Oxford (age 56) died. In His son [his son] Robert de Vere 6th Earl of Oxford 1257-1331 (age 38) succeeded 6th Earl of Oxford.
Before 09 Mar 1301 seven Earls and 96 Barons signed a letter to the Pope refuting the Pope's claim that Scotland was subject to the Pope's feudal overlordship. The letter was never sent. Those who signed include: John Warenne 6th Earl of Surrey (age 70), Thomas Plantagenet 2nd Earl of Leicester, 2nd Earl Lancaster, Earl of Salisbury and Lincoln (age 23), Ralph Monthermer 1st Baron Monthermer (age 31), Humphrey Bohun 4th Earl Hereford 3rd Earl Essex (age 25), Roger Bigod 5th Earl Norfolk (age 56), Richard Fitzalan 8th Earl of Arundel (age 34), Guy Beauchamp 10th Earl Warwick (age 29), Aymer de Valence 2nd Earl Pembroke (age 26), William Leybourne 1st Baron Leybourne (age 59), Henry Plantagenet 3rd Earl of Leicester 3rd Earl Lancaster (age 20), William Latimer 1st Baron Latimer of Corby (age 58), Edmund Hastings, John Hastings 2nd Baron Hastings 14th Baron Bergavenny (age 14), Edmund Mortimer 2nd Baron Mortimer of Wigmore (age 50), Fulk Fitzwarin 2nd Baron Fitzwarin (age 16), Henry Percy 9th and 1st Baron Percy (age 27), Robert Fitzwalter 1st Baron Fitzwalter (age 54), John Beauchamp 1st Baron Beauchamp Somerset (age 26), William de Braose 2nd Baron de Braose (age 41), John Botetort 1st Baron Botetort (age 36), Reginald Grey 1st Baron Grey of Wilton (age 61), John Moels 1st Baron Moels (age 32), Thomas Berkeley 6th and 1st Baron Berkeley (age 55), Robert de Vere 5th Earl of Oxford, John Strange 1st Baron Strange Knockin (age 48), Thomas Multon 1st Baron Multon (age 25), Robert Clifford 1st Baron Clifford (age 26), Walter Beauchamp (age 58), Alan Zouche 1st Baron Zouche Ashby (age 33), John Segrave 2nd Baron Segrave (age 45), William Ferrers 1st Baron Ferrers of Groby (age 29), Simon Montagu 1st Baron Montagu (age 51), Piers Mauley, Ralph Neville 1st Baron Neville of Raby (age 38), John Mohun 1st Baron Dunster (age 32), Roger Scales 1st Baron Scales, Thomas Furnival 1st Baron Furnivall (age 41), Hugh Bardolf 1st Baron Bardolf (age 41), Gilbert Talbot 1st Baron Talbot (age 24), William Deincourt 1st Baron Deincourt, Edmund Stafford 1st Baron Stafford (age 28), Walter Fauconberg 1st Baron Fauconberg (age 81). 
[his son] Alphonse Vere was born to Robert de Vere 5th Earl of Oxford and .
[his daughter] Joan Vere was born to Robert de Vere 5th Earl of Oxford and .
Paternal Family Tree: Vere
Maternal Family Tree: Petronilla Grandesmil Countess Leicester 1135-1212
Kings Wessex: Great x 11 Grand Son of King Edward "Elder" of the Anglo Saxons
Kings Franks: Great x 13 Grand Son of Louis "Pious" King Aquitaine I King Franks
Kings France: Great x 6 Grand Son of Robert "Pious" II King France
Philippa Lancaster Queen Consort Denmark 1394-1430 x 1
Joan Beaufort Queen Consort Scotland x 1
King Henry VI of England and II of France x 1
Margaret Stewart Dauphine of France 1424-1445 x 1
King James III of Scotland x 1
King Richard III of England x 1
Anne Neville Queen Consort England x 1
King Henry VII of England and Ireland x 1
Elizabeth York Queen Consort England x 1
Margaret Tudor Queen Scotland x 2
King Henry VIII of England and Ireland x 2
Mary Tudor Queen Consort France x 2
Queen Anne Boleyn of England x 3
Catherine Parr Queen Consort England x 3
Queen Mary I of England and Ireland x 2
Queen Catherine Howard of England x 2
Queen Elizabeth I of England and Ireland x 5
Jane "Nine Days Queen" Grey I Queen England and Ireland x 5
King Edward VI of England and Ireland x 2
King James I of England and Ireland and VI of Scotland x 7
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King Charles I of England, Scotland and Ireland x 7
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King James II of England Scotland and Ireland x 7
King William III of England, Scotland and Ireland x 7
Charles Palatinate Simmern II Elector Palatine Rhine 1651-1685 x 7
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Marie Louise Bourbon Queen Consort Spain 1662-1689 x 7
Mary Stewart II Queen England Scotland and Ireland x 7
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Charles Emmanuel III King Sardinia x 7
Louis I King Spain 1707-1724 x 7
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Elisabeth Therese Lorraine Queen Consort Sardinia 1711-1741 x 7
Frederick "The Great" I King Prussia 1712-1786 x 14
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Louise Hanover Queen Consort Denmark and Norway 1724-1751 x 7
Victor Amadeus III King Sardinia 1726-1796 x 7
President George Washington x 2
King George III of Great Britain and Ireland x 7
Frederick William II King Prussia 1744-1797 x 14
Queen Sophia of Sweden 1746-1813 x 7
Electress Wilhelmina Caroline Oldenburg x 7
Charles XIII King Sweden 1748-1818 x 14
Christian VII King Denmark and Norway 1749-1808 x 7
Caroline Matilda Hanover Queen Consort Denmark and Norway 1751-1775 x 7
Louis XVIII King France 1755-1824 x 14
King Charles X of France 1757-1836 x 14
King George IV of Great Britain and Ireland x 7
King William IV of the United Kingdom x 7
Marie Sophie Hesse-Kassel Queen Consort Denmark and Norway 1767-1852 x 14
Frederick VI King Denmark and Norway 1768-1839 x 14
Caroline of Brunswick Queen Consort England x 7
Frederick William II King Prussia 1770-1840 x 14
Ernest Augustus King Hanover x 7
King Louis Philippe I of France x 7
Louis XVII King France 1785-1795 x 14
Frederick William IV King Prussia 1795-1861 x 14
Caroline Amalie Oldenburg Queen Norway 1796-1881 x 14
William I King Prussia 1797-1888 x 14
Maria Christina of the Two Sicilies Queen Consort Spain 1806-1878 x 14
Queen Louise Hesse-Kassel of Denmark 1817-1898 x 7
King Christian IX of Denmark 1818-1906 x 14
Queen Victoria of the United Kingdom x 7
George V King Hanover 1819-1878 x 7
Frederick III King Prussia x 14
Queen Sophia of Sweden and Norway 1836-1913 x 28
Victoria Empress Germany Queen Consort Prussia x 7
King Edward VII of the United Kingdom x 7
Frederick VIII King Denmark 1843-1912 x 21
Alexandra Glücksburg Queen Consort England x 21
George I King Greece 1845-1913 x 21
Gustav V King Sweden 1858-1950 x 28
Wilhelm Hohenzollern x 21
Maria de las Mercedes Unknown Queen Consort Spain 1860-1878 x 14
George V King United Kingdom x 28
Victoria Mary Teck Queen Consort England x 21
Frederick Charles I King Finland 1868-1940 x 7
Constantine I King Greece x 49
Maud Windsor Queen Consort Norway x 28
Christian X King Denmark 1870-1947 x 21
Alexandrine Mecklenburg-Schwerin Queen Consort Denmark 1879-1952 x 28
Gustaf Adolph VI King Sweden 1882-1973 x 28
Alfonso XIII King Spain 1886-1941 x 28
Victoria Eugénie Mountbatten Queen Consort Spain 1887-1969 x 7
Louise Mountbatten Queen Consort Sweden x 7
Alexander I King Greece 1893-1920 x 70
King Edward VIII of the United Kingdom x 49
King George VI of the United Kingdom x 49
Paul I King Greece 1901-1964 x 70
Olav Glücksburg V King Norway 1903-1991 x 49
Ingrid Bernadotte Queen Consort Denmark 1910-2000 x 49
Philip Mountbatten Duke Edinburgh x 56
Queen Elizabeth II of the United Kingdom x 326
Sophia Glücksburg Queen Consort Spain 1938- x 133
Juan Carlos I King Spain 1938- x 35
Constantine II King Hellenes 1940- x 133
Carl XVI King Sweden 1946- x 84
King Charles III x 382
Great x 3 Grandfather: Aubrey I de Vere
Great x 2 Grandfather: Aubrey II de Vere
Great x 3 Grandmother: Beatrice Unknown
Great x 1 Grandfather: Aubrey de Vere 1st Earl of Oxford 1115-1194
Great x 4 Grandfather: Richard de Clare
Great x 3 Grandfather: Gilbert de Clare
Great x 4 Grandmother: Rohese Giffard
Great x 2 Grandmother: Adelize de Clare
Great x 4 Grandfather: Hugh Claremont
Great x 3 Grandmother: Adeliza Claremont
GrandFather: Robert de Vere 3rd Earl of Oxford
Robert de Vere 5th Earl of Oxford 1240-1296
Great x 2 Grandfather: Saer Quincy
Great x 1 Grandfather: Robert Quincy
Great x 3 Grandfather: Simon Senlis 1st Earl of Northampton, Earl of Huntingdon
Great x 2 Grandmother: Maud Senlis
Great x 4 Grandfather: Waltheof Northumbria 1st Earl of Northampton 1st Earl Huntingdon
Great x 3 Grandmother: Maud Queen Consort Scotland
Great x 4 Grandmother: Judith Flanders Countess Huntingdon 1054-1086
GrandFather: Saer Quincy 1st Earl Winchester 1170-1219
Mother: Hawise Quincy Countess Oxford
Great x 4 Grandfather: Roger "Bearded" Beaumont
Great x 3 Grandfather: Robert Beaumont 1st Earl of Leicester Count Meulan
Great x 4 Grandmother: Adeline Meulan
Great x 2 Grandfather: Robert Beaumont 2nd Earl of Leicester 1104-1168
Great x 4 Grandfather: Hugh "Great" Capet 1057-1101
Great x 3 Grandmother: Elizabeth Capet Countess Leicester, Meulan and Surrey 1085-1131
Great x 4 Grandmother: Adelaide I Countess Vermandois -1120
Great x 1 Grandfather: Robert Beaumont 3rd Earl of Leicester -1190
Great x 4 Grandfather: Ralph de Gael 2nd Earl East Anglia
Great x 3 Grandfather: Raoul Gael
Great x 4 Grandmother: Emma Fitzosbern Countess East Anglia
GrandMother: Margaret Beaumont Countess Winchester
Great x 4 Grandfather: Hugh Grandesmil
Great x 3 Grandfather: Robert Grandesmil
Great x 4 Grandmother: Adelize Beaumont Oise
Great x 2 Grandfather: William Grandesmil
Great x 1 Grandmother: Petronilla Grandesmil Countess Leicester 1135-1212