On 24 Jun 1380 John Hastings 3rd Earl Pembroke (age 7) and [his future wife] Elizabeth Lancaster Duchess Exeter (age 17) were married at Kenilworth Castle [Map]. She by marriage Countess Pembroke. She the daughter of John of Gaunt 1st Duke Lancaster (age 40) and Blanche Plantagenet Duchess Lancaster. He the son of John Hastings 2nd Earl Pembroke and Anne Manny Countess Pembroke. They were half third cousins. He a great x 2 grandson of King Edward "Longshanks" I of England. She a granddaughter of King Edward III of England.

After 24 Jun 1380 John Hastings 3rd Earl Pembroke (age 7) and [his future wife] Elizabeth Lancaster Duchess Exeter (age 17) marriage annulled since she had become pregnant by John Holland 1st Duke Exeter (age 28) whom she subsequently married. It isn't clear whether John Holland was punished; he was half-brother to King Richard II of England (age 13) through their mother Joan "Fair Maid of Kent" Princess Wales (age 51).

On 24 Jun 1386 John Holland 1st Duke Exeter (age 34) and [his future wife] Elizabeth Lancaster Duchess Exeter (age 23) were married at Plymouth, Devon [Map]. She the daughter of John of Gaunt 1st Duke Lancaster (age 46) and Blanche Plantagenet Duchess Lancaster. He the son of Thomas Holland 1st Earl Kent and Joan "Fair Maid of Kent" Princess Wales. They were half second cousin once removed. He a great grandson of King Edward "Longshanks" I of England. She a granddaughter of King Edward III of England.

In 1400 John Cornwall 1st Baron Fanhope 1st Baron Milbroke (age 36) and Elizabeth Lancaster Duchess Exeter (age 36) were married. She the daughter of John of Gaunt 1st Duke Lancaster and Blanche Plantagenet Duchess Lancaster. He a great x 3 grandson of King John "Lackland" of England. She a granddaughter of King Edward III of England.

Before 01 Jun 1402 Thomas Mowbray 4th Earl Norfolk 2nd Earl Nottingham (age 16) and [his step-daughter] Constance Holland Countess Norfolk and Nottingham (age 15) were married. She by marriage Countess Norfolk, Countess Nottingham. She the daughter of John Holland 1st Duke Exeter and Elizabeth Lancaster Duchess Exeter (age 39). He the son of Thomas Mowbray 1st Duke of Norfolk and Elizabeth Fitzalan Duchess Norfolk (age 36). They were third cousins. He a great x 3 grandson of King Edward "Longshanks" I of England. She a great granddaughter of King Edward III of England.

Around 1410 John Grey (age 23) and [his step-daughter] Constance Holland Countess Norfolk and Nottingham (age 23) were married. She by marriage Baroness Grey of Ruthyn. She the daughter of John Holland 1st Duke Exeter and Elizabeth Lancaster Duchess Exeter (age 46). He a great x 4 grandson of King Edward "Longshanks" I of England. She a great granddaughter of King Edward III of England.

Before 1427 [his son-in-law] John Fitzalan 14th Earl Arundel (age 18) and [his daughter] Constance Cornwall Countess of Arundel were married. There is some uncertainty as to whether they did marry; they were betrothed as children. She the daughter of John Cornwall 1st Baron Fanhope 1st Baron Milbroke (age 62) and Elizabeth Lancaster Duchess Exeter. He the son of John Fitzalan 13th Earl Arundel and Eleanor Berkeley Countess Arundel (age 44). They were third cousin once removed. He a great x 5 grandson of King Henry III of England. She a great granddaughter of King Edward III of England.

On 06 Mar 1427 [his former step-son] John Holland 2nd Duke Exeter (age 31) and Anne Stafford Duchess Exeter were married. She by marriage Duchess Exeter. She the daughter of Edmund Stafford 5th Earl Stafford and Anne of Gloucester Plantagenet Countess Eu and Stafford (age 44). He the son of John Holland 1st Duke Exeter and Elizabeth Lancaster Duchess Exeter. They were second cousins. He a great grandson of King Edward III of England. She a great granddaughter of King Edward III of England.

On 20 Jan 1433 [his former step-son] John Holland 2nd Duke Exeter (age 37) and Beatrice Aviz Duchess Exeter (age 51) were married. She by marriage Duchess Exeter. She the illegitmate daughter of King John I of Portugal (age 81) and Ines Peres. He the son of John Holland 1st Duke Exeter and Elizabeth Lancaster Duchess Exeter. He a great grandson of King Edward III of England.

After 25 Oct 1439 [his former step-son] John Holland 2nd Duke Exeter (age 44) and Anne Montagu Duchess Exeter (age 39) were married. She by marriage Duchess Exeter. She the daughter of John Montagu 3rd Earl Salisbury and Maud Francis Countess of Salisbury. He the son of John Holland 1st Duke Exeter and Elizabeth Lancaster Duchess Exeter. They were half third cousin once removed. He a great grandson of King Edward III of England. She a great x 3 granddaughter of King Edward "Longshanks" I of England.