In Jul 1368 [his father] John Hastings 2nd Earl Pembroke (age 20) and [his mother] Anne Manny Countess Pembroke were married. She by marriage Countess Pembroke. She the daughter of [his grandfather] Walter Manny 1st Baron Manny (age 58) and [his grandmother] Margaret Plantagenet 2nd Countess Norfolk. He the son of [his grandfather] Laurence Hastings 1st Earl Pembroke and [his grandmother] Agnes Mortimer Countess of Pembroke. They were half fourth cousins. He a great x 5 grandson of King John of England. She a great granddaughter of King Edward I of England.

In Oct 1372 John Hastings 3rd Earl Pembroke was born to John Hastings 2nd Earl Pembroke (age 25) and Anne Manny Countess Pembroke. He a great x 2 grandson of King Edward I of England.

On 16 Apr 1375 [his father] John Hastings 2nd Earl Pembroke (age 27) died. He was buried at Hereford [Map]. His son John Hastings 3rd Earl Pembroke (age 2) succeeded 3rd Earl Pembroke, 5th Baron Hastings, 16th Baron Bergavenny Feudal Creation.

On 24 Jun 1380 John Hastings 3rd Earl Pembroke (age 7) and 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 Duchess of 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 I of England. She a granddaughter of King Edward III of England.

After 24 Jun 1380 John Hastings 3rd Earl Pembroke (age 7) and 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 05 Feb 1381 [his former brother-in-law] King Henry IV of England (age 13) and Mary Bohun (age 13) were married at Arundel Castle [Map]. She the daughter of Humphrey Bohun 7th Earl Hereford 6th Earl Essex 2nd Earl of Northampton and Joan Fitzalan Countess Essex, Hereford and Northampton (age 34). He the son of [his former father-in-law] John of Gaunt 1st Duke Lancaster (age 40) and Blanche Duchess of Lancaster. They were second cousins. He a grandson of King Edward III of England. She a great x 2 granddaughter of King Edward I of England.

In 1384 [his mother] Anne Manny Countess Pembroke died. Her son John Hastings 3rd Earl Pembroke (age 11) succeeded 3rd Baron Manny.

On 24 Jun 1386 John Holland 1st Duke Exeter (age 34) and [his former wife] Elizabeth Lancaster Duchess Exeter (age 23) were married at Plymouth, Devon [Map]. She the daughter of [his former father-in-law] John of Gaunt 1st Duke Lancaster (age 46) and Blanche Duchess of 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 I of England. She a granddaughter of King Edward III of England.

On 02 Feb 1387 King John I of Portugal (age 35) and [his former sister-in-law] Philippa of Lancaster Queen Consort Portugal (age 26) were married. She by marriage Queen Consort Portugal. She the daughter of [his former father-in-law] John of Gaunt 1st Duke Lancaster (age 46) and Blanche Duchess of Lancaster. He the son of Peter I King Portugal and Inês Castro. They were half fourth cousins. He a great x 5 grandson of King Henry "Curtmantle" II of England. She a granddaughter of King Edward III of England.

Around 1388 John Hastings 3rd Earl Pembroke (age 15) and Philippa Mortimer Countess Pembroke, Arundel and Surrey (age 12) were married. She by marriage Countess Pembroke. She the daughter of Edmund Mortimer 3rd Earl March, Earl Ulster and Philippa Plantagenet Countess March 5th Countess Ulster. He the son of John Hastings 2nd Earl Pembroke and Anne Manny Countess Pembroke. They were second cousin once removed. He a great x 2 grandson of King Edward I of England. She a great granddaughter of King Edward III of England.

Before 17 Sep 1388 Henry III King Castile (age 8) and [his former sister-in-law] Catherine of Lancaster Queen Consort Castile (age 15) were married at Palencia Cathedral [Map]. She by marriage Queen Consort Castile. She the daughter of [his former father-in-law] John of Gaunt 1st Duke Lancaster (age 48) and Constance of Castile Duchess of Lancaster (age 34). He the son of John I King Castile (age 30) and Eleanor Barcelona Queen Consort Castile. They were half second cousins. She a granddaughter of King Edward III of England.

On 07 Oct 1388 [his brother-in-law] Roger Mortimer 4th Earl March 6th Earl Ulster (age 14) and Eleanor Holland Countess March and Ulster (age 17) were married. She by marriage Countess March, Countess Ulster. She the daughter of Thomas Holland 2nd Earl Kent (age 38) and Alice Fitzalan Countess Kent (age 38). He the son of Edmund Mortimer 3rd Earl March, Earl Ulster and Philippa Plantagenet Countess March 5th Countess Ulster. They were second cousin once removed. He a great grandson of King Edward III of England. She a great x 2 granddaughter of King Edward I of England.

After 30 Dec 1389 Richard Fitzalan 9th Earl of Surrey 11th Earl of Arundel (age 43) and [his former wife] Philippa Mortimer Countess Pembroke, Arundel and Surrey (age 14) were married. She by marriage Countess Arundel Sussex, Countess Surrey. The difference in their ages was 29 years. She the daughter of Edmund Mortimer 3rd Earl March, Earl Ulster and Philippa Plantagenet Countess March 5th Countess Ulster. He the son of Richard Fitzalan 10th Earl of Arundel 8th Earl of Surrey and Eleanor Plantagenet Countess Arundel and Surrey. They were first cousin twice removed. He a great x 2 grandson of King Henry III of England. She a great granddaughter of King Edward III of England.

In Apr 1398 Thomas Poynings 5th Baron St John of Basing (age 47) and [his former wife] Philippa Mortimer Countess Pembroke, Arundel and Surrey (age 22) were married. She by marriage Baroness St John of Basing. The difference in their ages was 24 years. She the daughter of Edmund Mortimer 3rd Earl March, Earl Ulster and Philippa Plantagenet Countess March 5th Countess Ulster. She a great granddaughter of King Edward III of England.

In 1400 John Cornwall 1st Baron Fanhope 1st Baron Milbroke (age 36) and [his former wife] Elizabeth Lancaster Duchess Exeter (age 36) were married. She the daughter of [his former father-in-law] John of Gaunt 1st Duke Lancaster and Blanche Duchess of Lancaster. He a great x 3 grandson of King John of England. She a granddaughter of King Edward III of England.

On 26 Sep 1400 [his former wife] Philippa Mortimer Countess Pembroke, Arundel and Surrey (age 24) died.

On 24 Nov 1426 [his former wife] Elizabeth Lancaster Duchess Exeter (age 63) died. She was buried at St Mary's Church, Burford [Map].