In 1383 [her grandfather] William Furnival 4th Baron Furnivall (age 56) died. His daughter [her mother] Joan Furnival 5th Baroness Furnivall (age 8) succeeded 5th Baroness Furnivall.
In or before 1384 [her father] Thomas Neville Baron Furnivall (age 22) and [her mother] Joan Furnival 5th Baroness Furnivall (age 8) were married. He by marriage Baron Furnivall. He a great x 5 grandson of King Henry "Curtmantle" II of England.
Around 1384 Margaret Neville Countess Dorest was born to Thomas Neville Baron Furnivall (age 22) and Joan Furnival 5th Baroness Furnivall (age 9).
On 23 May 1395 [her mother] Joan Furnival 5th Baroness Furnivall (age 20) died.
After 23 May 1395 [her father] Thomas Neville Baron Furnivall (age 33) and [her step-mother] Ankaret Strange 7th Baroness Strange Blackmere, Baroness Talbot (age 34) were married. They were second cousin once removed. He a great x 5 grandson of King Henry "Curtmantle" II of England. She a great x 5 granddaughter of King John "Lackland" of England. 
Before 15 Feb 1404 Thomas Beaufort 1st Duke Exeter (age 27) and Margaret Neville Countess Dorest (age 20) were married. He the son of John of Gaunt 1st Duke Lancaster and Katherine Roet Duchess Lancaster. He a grandson of King Edward III of England. 
On 14 Mar 1406 [her father] Thomas Neville Baron Furnivall (age 44) died at Worksop Priory [Map]. His daughter [her sister] Maud Neville 6th Baroness Furnivall (age 13) succeeded 6th Baroness Furnivall.
On 05 Jul 1411 [her husband] Thomas Beaufort 1st Duke Exeter (age 34) was created 1st Earl Dorset. Margaret Neville Countess Dorest (age 27) by marriage Countess Dorset.
In or before 1412 [her son] Henry Beaufort was born to [her husband] Thomas Beaufort 1st Duke Exeter (age 34) and Margaret Neville Countess Dorest (age 27). He a great grandson of King Edward III of England.
Around 1413 Margaret Neville Countess Dorest (age 29) died.
On 31 Dec 1426 [her former husband] Thomas Beaufort 1st Duke Exeter (age 49) died at Greenwich, Kent [Map]. Some sources say 27 Dec 1426 and 01 Jan 1427. Duke Exeter and Earl Dorset extinct.
Paternal Family Tree: Fitzmaldred aka Neville
Descendants Family Trees:
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 x 6 Grand Daughter of King Henry "Curtmantle" II of England
Kings Scotland: Great x 9 Grand Daughter of Malcolm III King Scotland
Kings Franks: Great x 16 Grand Daughter of Louis "Pious" King Aquitaine I King Franks
Kings France: Great x 8 Grand Daughter of Louis "Fat" VI King France
Great x 4 Grandfather: Geoffrey Neville
Great x 3 Grandfather: Robert Neville
Great x 2 Grandfather: Ralph Neville 1st Baron Neville of Raby
Great x 1 Grandfather: Ralph Neville 2nd Baron Neville of Raby 8 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandfather: Roger Fitzjohn 4th Baron Warkworth
Great x 3 Grandfather: Robert Fitzroger 5th Baron Warkworth
Great x 2 Grandmother: Euphemia Clavering Baroness Neville Raby
7 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandfather: Alan Zouche
Great x 3 Grandmother: Margaret Zouche Baroness Warkworth 6 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandmother: Helen or Ela Quincy 5 x Great Grand Daughter of King Henry I "Beauclerc" England
GrandFather: John Neville 3rd Baron Neville of Raby 4 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Henry Audley
Great x 3 Grandfather: James Audley
Great x 4 Grandmother: Bertrade Mainwaring
Great x 2 Grandfather: Hugh Audley 1st Baron Audley Stratton Audley 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: William Longespée
Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Ela Longespée Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Idoine Camville
Great x 1 Grandmother: Alice Audley Baroness Greystoke and Neville 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Roger le Rous
Great x 2 Grandmother: Isolde le Rous
Father: Thomas Neville Baron Furnivall 5 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: William Percy 6th Baron Percy Topcliffe
Great x 3 Grandfather: Henry Percy 7th Baron Percy Topcliffe
Great x 2 Grandfather: Henry Percy 9th and 1st Baron Percy
Great x 4 Grandfather: John Warenne 6th Earl Surrey
Great x 3 Grandmother: Eleanor Warenne Baroness Percy Topcliffe
Great x 4 Grandmother: Alice Lusignan Countess of Surrey 1224-1256
Great x 1 Grandfather: Henry Percy 10th and 2nd Baron Percy 5 x Great Grand Son of King John "Lackland" 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 Grandmother: Eleanor Fitzalan Baroness Percy 4 x Great Grand Daughter of King John "Lackland" of England
GrandMother: Maud Percy Baroness Neville Raby 5 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Roger Clifford
Great x 3 Grandfather: Roger Clifford
Great x 4 Grandmother: Hawise Botreaux
Great x 2 Grandfather: Robert Clifford 1st Baron Clifford 6 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandfather: Robert Vipont Lord Westmoreland 4 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandmother: Isabella Vipont 5 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandmother: Isabel Fitzjohn
Great x 1 Grandmother: Idonia Clifford Baroness Percy 4 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Richard de Clare 6th Earl Gloucester 5th Earl Hertford
3 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandfather: Thomas de Clare 4 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandmother: Maud Lacy Countess Gloucester and Hertford 1223-1289
4 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 2 Grandmother: Maud Clare Baroness Clifford Baroness Welles 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Maurice Fitzgerald 4th Lord Offaly
Great x 3 Grandmother: Juliana Fitzgerald 2 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Emmeline Longespée Baroness Offaly Great Grand Daughter of King Henry "Curtmantle" II of England
Margaret Neville Countess Dorest 1384-1413 6 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Thomas Furnival
Great x 3 Grandfather: Thomas Furnival
Great x 2 Grandfather: Thomas Furnival 1st Baron Furnivall
Great x 1 Grandfather: Thomas Furnival 2nd Baron Furnivall 5 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandfather: Hugh Despencer
Great x 3 Grandfather: Hugh Despencer
Great x 2 Grandmother: Joan Despencer Baroness Furnivall 4 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandfather: Philip Basset
2 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandmother: Aline Basset 3 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandmother: Hawise Reginar
GrandFather: William Furnival 4th Baron Furnivall 5 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandfather: John "The Botiller" Verdun
Great x 3 Grandfather: Theobald Verdun 1st Lord Verdun
Great x 4 Grandmother: Margaret "Lady of Dulek" Lacy
Great x 2 Grandfather: Theobald Verdun 2nd Lord Verdun
Great x 4 Grandfather: Humphrey Bohun
Great x 3 Grandmother: Margery Bohun Lady Verdun
Great x 4 Grandmother: Eleanor de Braose
Great x 1 Grandmother: Joan Verdun Baroness Furnivall 4 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandfather: Roger Mortimer 1st Baron Mortimer of Wigmore Great Grand Son of King John "Lackland" of England
Great x 3 Grandfather: Edmund Mortimer 2nd Baron Mortimer of Wigmore 2 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandmother: Maud de Braose
Great x 2 Grandmother: Maud Mortimer Lady Verdun 3 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandfather: William Fiennes
Great x 3 Grandmother: Margaret Fiennes 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: Joan Furnival 5th Baroness Furnivall 6 x Great Grand Daughter of King John "Lackland" of England
