Paternal Family Tree: Mohun
Maternal Family Tree: Clemence Roches Countess Blois
In or before 1357 [her father] John Mohun 2nd Baron Mohun of Dunster [aged 36] and [her mother] Joan Burghesh Baroness Mohun [aged 37] were married. She by marriage Baroness Mohun of Dunster. They were fifth cousins. She a great x 5 granddaughter of King John of England.
Around 1367 Philippa Mohun Duchess York was born to John Mohun 2nd Baron Mohun of Dunster [aged 47] and Joan Burghesh Baroness Mohun [aged 48] in Dunster, Somerset.
In or before 1368 Walter Fitzwalter 4th Baron Fitzwalter [aged 22] and Philippa Mohun Duchess York were married. The difference in their ages was 21 years. They were fourth cousins. He a great x 4 grandson of King Henry "Curtmantle" II of England.
Around 1368 [her son] Walter Fitzwalter 5th Baron Fitzwalter was born to [her husband] Walter Fitzwalter 4th Baron Fitzwalter [aged 22] and Philippa Mohun Duchess York [aged 1]. He married 1397 his third cousin once removed Joan Devereux 3rd Baroness Devereux Baroness Burnell, daughter of John Devereux 1st Baron Devereux and Margaret Vere Baroness Devereux and Beaumont, and had issue.
On 15th September 1375 [her father] John Mohun 2nd Baron Mohun of Dunster [aged 55] died. Since he had no male issue the title Baron Mohun of Dunster went into abeyance between his three daughters. [her sister] Elizabeth Mohun Countess of Salisbury had one child who died in 1397. Philippa Mohun Duchess York [aged 8] didn't have issue. Maud Mohun Baroness Strange Knockin [aged 18] had one son Richard Strange 3rd Baron Dunster 7th Baron Strange Knockin who succeeded as 3rd Baron Mohun of Dunster on the death of his aunt Philippa Mohun Duchess York.
In or before 1381 1369 [her brother-in-law] John Strange 6th Baron Strange Knockin [aged 29] and [her sister] Maud Mohun Baroness Strange Knockin [aged 23] were married. She by marriage Baroness Strange Knockin. They were fourth cousins.
In 1381 [her future husband] Edward 2nd Duke of York 1st Duke Albemarle [aged 8] and Beatrice Burgundy Countess Rutland and Cork [aged 8] were married. She the daughter of Ferdinand I King Portugal [aged 35] and Leonor Teles Meneses Queen Consort Portugal. He the son of [her future father-in-law] Edmund of Langley 1st Duke of York [aged 39] and Isabella of Castile Duchess York [aged 26]. They were second cousin once removed. He a grandson of King Edward III of England.
After 7th August 1385 [her brother-in-law] William Montagu 2nd Earl Salisbury [aged 57] and [her sister] Elizabeth Mohun Countess of Salisbury were married. She by marriage Countess Salisbury. He the son of William Montagu 1st Earl Salisbury and Catherine Grandison Countess of Salisbury. They were half fifth cousin once removed.
Before 15th August 1385 Aubrey de Vere 10th Earl of Oxford [aged 47] and [her sister-in-law] Alice Fitzwalter Countess of Oxford were married. She by marriage Countess of Oxford. He the son of John de Vere 7th Earl of Oxford and Maud Badlesmere Countess of Oxford. They were second cousin once removed. He a great x 5 grandson of King Henry "Curtmantle" II of England. She a great x 4 granddaughter of King Henry "Curtmantle" II of England.
On 26th September 1386 [her husband] Walter Fitzwalter 4th Baron Fitzwalter [aged 41] died. His son Walter [aged 18] succeeded 5th Baron Fitzwalter.
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Westminster Chronicle. At that same time Walter Skirlaw, Bishop of Durham, was sent into Flanders to arrange and negotiate peace with the Flemings. Soon afterwards, the King of France ordered them not in any way to treat with the English about peace without his authority and licence, if they wished to live thereafter in quiet or in peace. Also, on the 19th day of November, the Duke of Lancaster landed at Plymouth with his men, safe and unharmed. Also, on the 22nd day of November, Sir Baldwin, knight, took as wife the widow1 of Sir Nicholas Brembre. And on the 25th day of the same month, Sir John Golafre, knight, took as wife the daughter of the Lord de Mohun, who had once been joined in marriage to the son of Walter2.
Quo etiam tempore episcopus Dunelmensis W. Skyrlowe missus in Flandriam ad componendum et tractandum de pace cum Flandrensibus, mox rex Francorum mandavit eis ne aliquo modo cum Anglicis de pace tractarent absque ejus auctoritate et licentia si in quiete in posterum vellent vivere aut in pace. Item xix die Novembris dux Lancastriæ apud Plommouth cum suis sanus et incolumis applicuit. Item xxii die Novembris dominus Baldewynus miles duxit in uxorem relictam domini Nicholai Brembre. Et xxv die ejusdem mensis dominus Johannes Golafre miles duxit in uxorem fillam domini de Mohoun quæ quondam fuit copulata domino filio Walteri.
Note 1. Idonia Stodey, widow of Nicholas Brembre, married Baldwin Raddington,
Note 2. Philippa Mohun Duchess York [aged 22], widow of [her former husband] Walter Fitzwalter 4th Baron Fitzwalter, married John Golafre [aged 39]. Following John's death in 1396 she married Edward [aged 16], grandson of King Edward III, who in 1402 became 2nd Duke of York. He was killed at the Battle of Agincourt in 1415; she survived him by sixteen years.
On 25th November 1389 John Golafre [aged 39] and Philippa Mohun Duchess York [aged 22] were married.
On 18th November 1396 [her husband] John Golafre [aged 46] died.
Around 1397 Walter Fitzwalter 5th Baron Fitzwalter [aged 29] and Joan Devereux 3rd Baroness Devereux Baroness Burnell [aged 18] were married. He the son of Walter Fitzwalter 4th Baron Fitzwalter and Philippa Mohun Duchess York [aged 30]. They were third 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 of England.
Before 7th October 1398 Edward 2nd Duke of York 1st Duke Albemarle [aged 25] and Philippa Mohun Duchess York [aged 31] were married. He the son of Edmund of Langley 1st Duke of York [aged 57] and Isabella of Castile Duchess York.
On 20th September 1400 [her sister] Maud Mohun Baroness Strange Knockin [aged 43] died.
On 1st August 1402 [her father-in-law] Edmund of Langley 1st Duke of York [aged 61] died at King's Langley, Hertfordshire [Map]. His son [her husband] Edward [aged 29] succeeded 2nd Duke York, 2nd Earl Cambridge and inherited his estates which included Conisbrough Castle [Map]. Philippa Mohun Duchess York [aged 35] by marriage Duchess York.
On 3rd October 1404 [her mother] Joan Burghesh Baroness Mohun [aged 85] died at Guest House Canterbury Cathedral. She was buried at Canterbury, Kent [Map].
In 1406 Walter Fitzwalter 5th Baron Fitzwalter [aged 38] died. His son Humphrey [aged 8] succeeded 6th Baron Fitzwalter.
In May 1406 [her brother-in-law] Richard of Conisbrough 1st Earl Cambridge [aged 20] and Anne Mortimer [aged 15] were married. The marriage apparently took place in secret possibly because she was a descendant of King Edward III of England although she wasn't at the time Heir to the Throne of England although their issue would become so. She died five years later. The suspected false paternity has no effect on the claim of the House of York since it is Richard's wife Ann Mortimer who passes claim to her children. She the daughter of Roger Mortimer 4th Earl March 3rd Earl of Ulster and Eleanor Holland Countess March and Ulster. He the son of [her father-in-law] Edmund of Langley 1st Duke of York and Isabella of Castile Duchess York. They were first cousin twice removed. He a grandson of King Edward III of England. She a great x 2 granddaughter of King Edward III of England.
After 21st September 1411 [her brother-in-law] Richard of Conisbrough 1st Earl Cambridge [aged 26] and Maud Clifford Countess Cambridge [aged 22] were married. He the son of [her father-in-law] Edmund of Langley 1st Duke of York and Isabella of Castile Duchess York. They were third cousin twice removed. He a grandson of King Edward III of England. She a great x 4 granddaughter of King Edward I of England.
In 1414 [her brother-in-law] Richard of Conisbrough 1st Earl Cambridge [aged 28] was created 1st Earl Cambridge. Maud Clifford Countess Cambridge [aged 25] by marriage Countess Cambridge.
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On 14th January 1415 [her sister] Elizabeth Mohun Countess of Salisbury died in Salisbury.
On 25th October 1415 King Henry V of England [aged 29] defeated a French army at the Battle of Agincourt.
The battle is described by three Chroniclers who were present:
Jean de Waurin: "1, the author of this work, know the truth of the matter, for in that assembly I was among the French".
Jean le Fevre de St Remy: "I who write this, seated on a horse among the baggage at the rear of the battle, along with the other priests who were present".
The anonymous author of the 
Deeds of King Henry V i.e. Deeds of Henry V: "while I was on the other side with the English".
Thomas Camoys 1st Baron Camoys [aged 64] commanded the Rearguard. Richard de Vere 11th Earl of Oxford [aged 30] commanded. Humphrey Lancaster 1st Duke Gloucester [aged 25] was wounded, and was protected by his brother King Henry V of England.
[her husband] Edward 2nd Duke of York 1st Duke Albemarle [aged 42], commander of the Vanguard, was killed; the most senior English casualty. Duke Albemarle, Earl of Rutland and Earl Cork extinct. His nephew Richard [aged 4] succeeded 3rd Duke York and inherited his estates including Conisbrough Castle [Map].
John Fortescue [aged 35], Dafydd Gam Brecon [aged 35] and Edward Burnell [aged 44] and Roger Vaughan of Bredwardine [aged 38] were killed.
Michael de la Pole 3rd Earl Suffolk [aged 21] was killed. His brother William [aged 19] succeeded 4th Earl Suffolk, 4th Baron Pole.
Chronicle of Robert Fabyan [-1512]. [24th February 1421] ... and forthe I wyll precede to shewe unto you some parte of the great honour that was vsed & excercysed upon the daye of the sayd quenes coronacion, whiche was after solempnyzed in seynt Peters churche of Westmynster, upon the daye of seynt Mathy the Apostle, or the xxiiii [24th] day of February. After which solempnyzacon in yt churche endyd, she was conveyed into the great halle of Westmynster, & there sette to dyner; upon whose right hande satte, at the ende of the same table, the archebysshop of Caunterbury [aged 58], and Henry [aged 46], surnamed the rych cardynall of Winchester; and upon the lefte hande of ye quene sat the kynge of Scottes [aged 26] in his astate, ye whiche was servyd with coveryd messe lyke unto the forenamed bysshops, but after theym. And upon the same hande & syde, nere to the borde ende, sat the duchesse of Yorke [aged 54]1, and the coutesse of Huntyngdon [aged 58]. The erle of the Marche [aged 29] holdynga ceptre in his hande, knelyd upon the right syde. The erle marshal in lyke maner knelyd upon the left hande of ye quene. The conntesse of Kent [aged 41]2 sat under the table at the ryght foot, and the coutesse marshall at the left foot. The duke of Glouceter, sir Humfrey [aged 30], was that daye overloker, and stode before the quene bare hedyd. Sir Richarde Neuyll was that daye carver to the quene. The erlys brother of Suffolk cupberer, sir lohn Stewarde sewar. The lord Clyfford paterer, instede of ye erle of Warwik. The lord Wyllughby boteler, in stede of ye erle of Arudell. The lorde Gray Ruthyn [aged 59], or Ryffyn, naperer. The lord of Awdeley amner, in stede of the erle of Cambrydge. The erle of Worceter [aged 25] was that day erle marshal, in absence of the erle marshall, the whiche rode aboute the halle upon a great courser, wt a multytude of typped stauys aboute hym, to kepe the rome in the halle.
Note 1. her husband Edward 2nd Duke of York 1st Duke Albemarle had been killed six years before at the Battle of Agincourt so correctly Dowager Duchess of York.
Note 2. her husband Edmund Holland 4th Earl Kent had been killed thirteen years before at the Battle of Île de Bréhat so correctly Dowager Countess of Kent.
On 17th July 1431 Philippa Mohun Duchess York [aged 64] died at Carisbrooke Castle [Map]. She was buried at Chapel of St Nicholas, Westminster Abbey [Map]. Her nephew Richard [aged 49] succeeded 3rd Baron Mohun of Dunster as a result of her death bring the title out of abeyance.
Effigy of Philippa Duchess of York. Philippa Duchess of York.
Kings Wessex: Great x 11 Grand Daughter of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 7 Grand Daughter of Owain "Great" King Gwynedd
Kings Seisyllwg: Great x 13 Grand Daughter of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 8 Grand Daughter of Maredudd ap Bleddyn King Powys
Kings England: Great x 6 Grand Daughter of King John of England
Kings Scotland: Great x 8 Grand Daughter of King David I of Scotland
Kings France: Great x 12 Grand Daughter of Hugh I King of the Franks
Kings Duke Aquitaine: Great x 16 Grand Daughter of Ranulf I Duke Aquitaine
Kings Spain: Great x 8 Grand Daughter of Alfonso VII King Castile VII King Leon
Great x 4 Grandfather: Reginald Mohun 
Great x 3 Grandfather: John Mohun
Great x 4 Grandmother: Hawise Fitzpeter
Great x 2 Grandfather: John Mohun 5 x Great Grandson of King Henry I "Beauclerc" England
Great x 4 Grandfather: William Ferrers 5th Earl of Derby 
3 x Great Grandson of King Henry I "Beauclerc" England
Great x 3 Grandmother: Joan Ferrers 4 x Great Granddaughter of King Henry I "Beauclerc" England
Great x 4 Grandmother: Sibyl Marshal 
6 x Great Granddaughter of Hugh I King of the Franks
Great x 1 Grandfather: John Mohun 1st Baron Dunster 6 x Great Grandson of King Henry I "Beauclerc" England
Great x 4 Grandfather: Piers Fitzherbert 
Great x 3 Grandfather: Reginald Fitzpiers
Great x 2 Grandmother: Eleanor Fitzpiers
Grandfather: John Mohun 7 x Great Grandson of King Henry I "Beauclerc" England
Great x 2 Grandfather: Robert Tiptoft 
Great x 1 Grandmother: Ada Tiptoft Baroness Dunster
Great x 2 Grandmother: Eva Chaworth 
Father: John Mohun 2nd Baron Mohun of Dunster 8 x Great Grandson of King Henry I "Beauclerc" England
Great x 4 Grandfather: Stephen Segrave 
Great x 3 Grandfather: Gilbert Segrave
Great x 4 Grandmother: Rohese Despencer 
Great x 2 Grandfather: Nicholas Segrave 1st Baron Segrave
Great x 1 Grandfather: John Segrave 2nd Baron Segrave
Great x 3 Grandfather: Geoffrey de Lucy of Newington in Kent 
Great x 2 Grandmother: Maud de Lucy
Great x 4 Grandfather: William Cantilupe 
Great x 3 Grandmother: Nichole Cantilupe
Grandmother: Christiana Segrave
Philippa Mohun Duchess York 6 x Great Granddaughter of King John of England
Great x 1 Grandfather: Robert Burghesh 1st Baron Burghesh 
Grandfather: Bartholomew "The Elder" Burghesh 1st Baron Burghesh
Great x 2 Grandfather: Gunselin Badlesmere 
Great x 1 Grandmother: Maud Badlesmere Baroness Burghesh
Great x 2 Grandmother: Joan Fitzbernard
Mother: Joan Burghesh Baroness Mohun 5 x Great Granddaughter of King John of England
Great x 4 Grandfather: Theobald Butler 
Great x 3 Grandfather: John "The Botiller" Verdun 
Great x 4 Grandmother: Rohesia Verdun
Great x 2 Grandfather: Theobald Verdun 1st Lord Verdun 9 x Great Grandson of Maredudd ab Owain King Deheubarth King Powys King Gwynedd
Great x 4 Grandfather: Gilbert Lacy 
7 x Great Grandson of Maredudd ab Owain King Deheubarth King Powys King Gwynedd
Great x 3 Grandmother: Margaret "Lady of Dulek" Lacy 8 x Great Granddaughter of Maredudd ab Owain King Deheubarth King Powys King Gwynedd
Great x 4 Grandmother: Isabel Bigod 
7 x Great Granddaughter of Hugh I King of the Franks
Great x 1 Grandfather: Theobald Verdun 2nd Lord Verdun 5 x Great Grandson of King David I of Scotland
Great x 4 Grandfather: Humphrey Bohun 2nd Earl Hereford 1st Earl Essex 
2 x Great Grandson of King David I of Scotland
Great x 3 Grandfather: Humphrey Bohun 3 x Great Grandson of King David I of Scotland
Great x 4 Grandmother: Matilda Lusignan Countess Hereford and Essex 
Great x 2 Grandmother: Margery Bohun Lady Verdun 4 x Great Granddaughter of King David I of Scotland
Great x 4 Grandfather: William de Braose 9th Baron Abergavenny 7th Baron Bramber 
7 x Great Grandson of Maredudd ab Owain King Deheubarth King Powys King Gwynedd
Great x 3 Grandmother: Eleanor de Braose 7 x Great Granddaughter of Hugh I King of the Franks
Great x 4 Grandmother: Eva Marshal 6 x Great Granddaughter of Hugh I King of the Franks
Grandmother: Elizabeth Verdun Baroness Burghesh 4 x Great Granddaughter of King John of England
Great x 4 Grandfather: Ralph Mortimer 
Great x 3 Grandfather: Roger Mortimer 1st Baron Mortimer of Wigmore Great Grandson of King John of England
Great x 4 Grandmother: Gwladus verch Llewelyn "Dark Eyed" Aberffraw Granddaughter of King John of England
Great x 2 Grandfather: Edmund Mortimer 2nd Baron Mortimer of Wigmore 2 x Great Grandson of King John of England
Great x 4 Grandfather: William de Braose 9th Baron Abergavenny 7th Baron Bramber 7 x Great Grandson of Maredudd ab Owain King Deheubarth King Powys King Gwynedd
Great x 3 Grandmother: Maud de Braose 7 x Great Granddaughter of Hugh I King of the Franks
Great x 4 Grandmother: Eva Marshal 6 x Great Granddaughter of Hugh I King of the Franks
Great x 1 Grandmother: Maud Mortimer Lady Verdun 3 x Great Granddaughter of King John of England
Great x 4 Grandfather: Enguerrand Ingleram Fiennes 
9 x Great Grandson of King Edward "Elder" of the Anglo Saxons
Great x 3 Grandfather: William Fiennes 10 x Great Grandson of King Edward "Elder" of the Anglo Saxons
Great x 4 Grandmother: Isabel Provence 
Great x 2 Grandmother: Margaret Fiennes 4 x Great Granddaughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: John Beaumont 
2 x Great Grandson of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Blanche Beaumont 3 x Great Granddaughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Jeanne Chateaudun