On 29 Sep 1397 King Richard II (age 30) rewarded his relations with Dukedoms, possibly for their part in downfall of Thomas of Woodstock 1st Duke of Gloucester (deceased), Thomas Beauchamp 12th Earl Warwick (age 59) and Richard Fitzalan 9th Earl Surrey 11th Earl Arundel (deceased) ...
His older half-brother John Holland 1st Duke Exeter (age 45) was created 1st Duke Exeter. [her aunt] Elizabeth Lancaster Duchess Exeter (age 34) by marriage Duchess Exeter.
His nephew [her uncle] Thomas Holland 1st Duke Surrey (age 23) was created 1st Duke Surrey.
His second cousin once removed Thomas Mowbray 1st Duke of Norfolk (age 29) was created 1st Duke Norfolk. Elizabeth Fitzalan Duchess Norfolk (age 31) by marriage Duchess Norfolk.
His first cousin Edward York 2nd Duke of York 1st Duke Albemarle (age 24) was created 1st Duke Albemarle aka Aumale. Beatrice Burgundy Countess Rutland and Cork (age 24) by marriage Duchess Albemarle aka Aumale.
His illegitimate first cousin [her father] John Beaufort 1st Marquess Somerset and Dorset (age 24) was created 1st Marquess Somerset, 1st Marquess Dorset. [her mother] Margaret Holland Duchess Clarence (age 12) by marriage Marchioness Somerset, Marchioness Dorset.
Ralph Neville 1st Earl of Westmoreland (age 33) was created 1st Earl of Westmoreland. [her aunt] Joan Beaufort Countess of Westmoreland (age 18) by marriage Countess of Westmoreland.
On 27 Nov 1397 [her father] John Beaufort 1st Marquess Somerset and Dorset (age 24) and [her mother] Margaret Holland Duchess Clarence (age 12) were married. She by marriage Countess Somerset. She the daughter of Thomas Holland 2nd Earl Kent and Alice Fitzalan Countess Kent 1350-1416 (age 47). He the son of John of Gaunt 1st Duke Lancaster (age 57) and Katherine Roet Duchess Lancaster (age 47). They were half third cousins. He a grandson of King Edward III of England. She a great x 2 granddaughter of King Edward "Longshanks" I of England. 
In 1409 Margaret Beaufort Countess Devon was born to John Beaufort 1st Marquess Somerset and Dorset (age 36) and Margaret Holland Duchess Clarence (age 24) at Westminster Palace [Map]. She a great granddaughter of King Edward III of England.
On 16 Mar 1410 [her father] John Beaufort 1st Marquess Somerset and Dorset (age 37) died at Hospital of St Katharine's by the Tower Tower Hill [Map]. He was buried at St Michael's Chapel, Canterbury Cathedral [Map]. His son [her brother] Henry Beaufort 2nd Earl Somerset 1401-1418 (age 9) succeeded 2nd Earl Somerset.
In Nov 1411 [her step-father] Thomas Lancaster 1st Duke of Clarence (age 23) and [her mother] Margaret Holland Duchess Clarence (age 26) were married. She the daughter of Thomas Holland 2nd Earl Kent and Alice Fitzalan Countess Kent 1350-1416 (age 61). He the son of Henry IV King England (age 44) and Mary Bohun. They were first cousin once removed. She a great x 2 granddaughter of King Edward "Longshanks" I of England. 
Around 1420 Thomas Courtenay 13th Earl Devon (age 6) and Margaret Beaufort Countess Devon (age 11) were married. She the daughter of John Beaufort 1st Marquess Somerset and Dorset and Margaret Holland Duchess Clarence (age 35). He the son of Hugh Courtenay 12th Earl Devon 1389-1422 (age 31) and Anne Talbot Countess Devon 1393-1441 (age 27). They were third cousins. He a great x 4 grandson of King Edward "Longshanks" I of England. She a great granddaughter of King Edward III of England. 
On 16 Jun 1422 [her father-in-law] Hugh Courtenay 12th Earl Devon 1389-1422 (age 33) died. His son [her husband] Thomas Courtenay 13th Earl Devon (age 8) succeeded 13th Earl Devon, 8th Baron Okehampton, 6th Baron Courtenay. Margaret Beaufort Countess Devon (age 13) by marriage Countess Devon.
In 1432 [her son] Thomas Courtenay 14th Earl Devon was born to [her husband] Thomas Courtenay 13th Earl Devon (age 18) and Margaret Beaufort Countess Devon (age 23). He a great x 2 grandson of King Edward III of England.
In 1435 [her son] John Courtenay 15th Earl Devon was born to [her husband] Thomas Courtenay 13th Earl Devon (age 21) and Margaret Beaufort Countess Devon (age 26) at Okehampton, Devon. He a great x 2 grandson of King Edward III of England.
On 31 Dec 1439 [her mother] Margaret Holland Duchess Clarence (age 54) died.
In 1449 Margaret Beaufort Countess Devon (age 40) died.
In 1458 [her former husband] Thomas Courtenay 13th Earl Devon (age 44) died at Yattendon Castle [Map]. He was buried at Courtenay Chantry Chapel Exeter Cathedral. His son [her son] Thomas Courtenay 14th Earl Devon (age 26) succeeded 14th Earl Devon, 9th Baron Okehampton, 7th Baron Courtenay.
[her son] Henry Courtenay was born to Thomas Courtenay 13th Earl Devon and Margaret Beaufort Countess Devon. He a great x 2 grandson of King Edward III of England.
[her daughter] Joan Courtenay was born to Thomas Courtenay 13th Earl Devon and Margaret Beaufort Countess Devon. She a great x 2 granddaughter of King Edward III of England.
Paternal Family Tree: Anjou aka Plantagenet
Maternal Family Tree: Aoife NI Diarmait Macmurrough Countess Pembroke and Buckingham 1145-1188
Descendants Family Trees:
King Edward "Longshanks" I of England 1239-1307
King Edward III of England 1312-1377
John of Gaunt 1st Duke Lancaster 1340-1399
Eleanor Plantagenet Countess Arundel and Surrey 1318-1372
Richard Fitzalan 10th Earl Arundel 8th Earl Surrey 1306-1376
Thomas Holland 2nd Earl Kent 1350-1397
Kings Wessex: Great x 11 Grand Daughter of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 8 Grand Daughter of Owain "Great" King Gwynedd 1100-1170
Kings Seisyllwg: Great x 14 Grand Daughter of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 9 Grand Daughter of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great Grand Daughter of King Edward III of England
Kings Scotland: Great x 9 Grand Daughter of Malcolm III King Scotland
Kings Franks: Great x 7 Grand Daughter of Louis VII King Franks
Kings France: Great x 3 Grand Daughter of Philip "The Fair" IV King France
Great x 4 Grandfather: King Henry III of England Son of King John "Lackland" of England
Great x 3 Grandfather: King Edward "Longshanks" I of England Son of King Henry III of England
Great x 4 Grandmother: Eleanor of Provence Queen Consort England
Great x 2 Grandfather: King Edward II of England Son of King Edward "Longshanks" I of England
Great x 4 Grandfather: Ferdinand III King Castile III King Leon
Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Eleanor of Castile Queen Consort England 2 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 1 Grandfather: King Edward III of England Son of King Edward II of England
Great x 4 Grandfather: Philip "Bold" III King France
2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Philip "The Fair" IV King France 3 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Isabella Barcelona Queen Consort France 1248-1271
Great x 2 Grandmother: Isabella of France Queen Consort England 4 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Henry I King Navarre 1244-1274
4 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandmother: Joan Blois I Queen Navarre 1273-1305 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Blanche Capet Queen Navarre 1248-1302 2 x Great Grand Daughter of King Henry "Curtmantle" II of England
GrandFather: John of Gaunt 1st Duke Lancaster Son of King Edward III of England
Great x 4 Grandfather: John Hainault I Count Hainault 1218-1257 4 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandfather: John Hainault II Count Hainault II Count Holland 1247-1304 5 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandmother: Adelaide Gerulfing Countess Hainault 1230-1284
4 x Great Grand Daughter of King William "Conqueror" I of England
Great x 2 Grandfather: William Hainault I Count Hainault III Count Avesnes III Count Holland II Count Zeeland 6 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandfather: Henry "Great" Luxemburg V Count Luxemburg III Count Namur 1216-1281
Great x 3 Grandmother: Philippa Luxemburg Countess Hainault and Holland 1252-1311 5 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandmother: Margaret of Bar Countess Luxemburg and Namur 1220-1275 4 x Great Grand Daughter of King William "Conqueror" I of England
Great x 1 Grandmother: Philippa of Hainault Queen Consort England 5 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Philip "Bold" III King France 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Charles Valois I Count Valois 3 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Isabella Barcelona Queen Consort France 1248-1271
Great x 2 Grandmother: Joan Valois Countess Zeeland Holland Avesnes and Hainault 4 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Charles II King Naples 1254-1309 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Margaret Capet Countess Valois 1273-1299 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Mary of Hungary Queen Consort Naples
Father: John Beaufort 1st Marquess Somerset and Dorset Grand Son of King Edward III of England
Great x 1 Grandfather: Giles "Payne" Roet
GrandMother: Katherine Roet Duchess Lancaster
Margaret Beaufort Countess Devon 1409-1449 Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Thurstan de Holland
Great x 3 Grandfather: Robert de Holand of Upholland
Great x 2 Grandfather: Robert Holland 1st Baron Holand
Great x 1 Grandfather: Thomas Holland 1st Earl Kent 4 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Roger Zouche
6 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandfather: Alan Zouche 1st Baron Zouche Ashby 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Ela Longespée Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 2 Grandmother: Maud Zouche Baroness Holand 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Nicholas Segrave 1st Baron Segrave
Great x 3 Grandmother: Eleanor Segrave
Great x 4 Grandmother: Maud de Lucy
GrandFather: Thomas Holland 2nd Earl Kent Great Grand Son of King Edward "Longshanks" I of England
Great x 4 Grandfather: King Henry III of England Son of King John "Lackland" of England
Great x 3 Grandfather: King Edward "Longshanks" I of England Son of King Henry III of England
Great x 4 Grandmother: Eleanor of Provence Queen Consort England
Great x 2 Grandfather: Edmund of Woodstock 1st Earl Kent Son of King Edward "Longshanks" I of England
Great x 4 Grandfather: Philip "Bold" III King France 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Margaret of France Queen Consort England 1279-1318 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Maria Reginar Queen Consort France 1256-1321 5 x Great Grand Daughter of King William "Conqueror" I of England
Great x 1 Grandmother: Joan "Fair Maid of Kent" Princess Wales Grand Daughter of King Edward "Longshanks" I of England
Great x 4 Grandfather: Baldwin Wake
Great x 3 Grandfather: John Wake 1st Baron Wake of Liddell 2 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandmother: Hawise Quincy Great Grand Daughter of King John "Lackland" of England
Great x 2 Grandmother: Margaret Wake Countess Kent 3 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandfather: William Fiennes
Great x 3 Grandmother: Joan Fiennes Baroness Wake Liddell 4 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Blanche Beaumont
3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Mother: Margaret Holland Duchess Clarence 2 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 4 Grandfather: John Fitzalan 7th Earl Arundel 1246-1272 5 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandfather: Richard Fitzalan 8th Earl Arundel 3 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandmother: Isabella Mortimer Countess Arundel -1291
2 x Great Grand Daughter of King John "Lackland" of England
Great x 2 Grandfather: Edmund Fitzalan 9th Earl Arundel 4 x Great Grand Son of King John "Lackland" of England
Great x 1 Grandfather: Richard Fitzalan 10th Earl Arundel 8th Earl Surrey 5 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandfather: John Warenne 6th Earl Surrey
Great x 3 Grandfather: William Warenne
Great x 4 Grandmother: Alice Lusignan Countess of Surrey 1224-1256
Great x 2 Grandmother: Alice Warenne Countess Arundel
Great x 4 Grandfather: Robert de Vere 5th Earl of Oxford 1240-1296
Great x 3 Grandmother: Joan Vere
GrandMother: Alice Fitzalan Countess Kent 1350-1416 2 x Great Grand Daughter of King Henry III of England
Great x 4 Grandfather: King Henry III of England Son of King John "Lackland" of England
Great x 3 Grandfather: Edmund "Crouchback" Plantagenet 1st Earl of Leicester 1st Earl Lancaster Son of King Henry III of England
Great x 4 Grandmother: Eleanor of Provence Queen Consort England
Great x 2 Grandfather: Henry Plantagenet 3rd Earl of Leicester 3rd Earl Lancaster Grand Son of King Henry III of England
Great x 4 Grandfather: Robert Capet Count of Artois Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Blanche Capet Queen Navarre 1248-1302 2 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Matilda Reginar Countess Saint Pol 1224-1288 4 x Great Grand Daughter of King William "Conqueror" I of England
Great x 1 Grandmother: Eleanor Plantagenet Countess Arundel and Surrey 
Great Grand Daughter of King Henry III of England
Great x 4 Grandfather: Patrick Chaworth
Great x 3 Grandfather: Patrick Chaworth
Great x 2 Grandmother: Maud Chaworth
Great x 4 Grandfather: William Beauchamp 9th Earl Warwick
Great x 3 Grandmother: Isabella Beauchamp Baroness Monthermer
