Before 1399 [his father] Richard de Vere 11th Earl of Oxford (age 13) and Alice Holland Countess of Oxford (age 6) were married. She the daughter of John Holland 1st Duke Exeter (age 46) and Elizabeth Lancaster Duchess Exeter (age 35). He the son of Aubrey de Vere 10th Earl of Oxford (age 60) and Alice Fitzwalter Countess of Oxford. He a great x 5 grandson of King Henry "Curtmantle" II of England. She a great granddaughter of King Edward III of England.

Around 1406 [his father] Richard de Vere 11th Earl of Oxford (age 20) and [his mother] Alice Sergeaux Countess Oxford were married. She by marriage Countess of Oxford. He the son of Aubrey de Vere 10th Earl of Oxford and Alice Fitzwalter Countess of Oxford. He a great x 5 grandson of King Henry "Curtmantle" II of England.

In 1425 John de Vere 12th Earl of Oxford (age 16) and Elizabeth Howard Countess of Oxford (age 15) were married. She by marriage Countess of Oxford. He the son of Richard de Vere 11th Earl of Oxford and Alice Sergeaux Countess Oxford. She a great x 5 granddaughter of King John "Lackland" of England.

After 29 Mar 1461 [his son-in-law] William Norreys (age 20) and [his daughter] Jane Vere were married. She the daughter of John de Vere 12th Earl of Oxford (age 52) and Elizabeth Howard Countess of Oxford (age 51).

Before 20 Feb 1462 [his son] Aubrey de Vere (age 21) and [his daughter-in-law] Anne Stafford Baroness Cobham Sternborough (age 16) were married. She the daughter of Humphrey Stafford 1st Duke of Buckingham and Anne Neville Duchess Buckingham (age 54). He the son of John de Vere 12th Earl of Oxford (age 53) and Elizabeth Howard Countess of Oxford (age 52). They were third cousin once removed. She a great x 2 granddaughter of King Edward III of England.