On 24th August 1369 [his father] Edmund Mortimer 3rd Earl March, Earl of Ulster and [his mother] Philippa Plantagenet Countess March 2nd Countess Ulster were married at Reading Abbey, Berkshire. She by marriage Countess March. He by marriage Earl of Ulster. She the daughter of [his grandfather] Lionel of Antwerp 1st Duke of Clarence and [his grandmother] Elizabeth Burgh Duchess of Clarence. He the son of Roger Mortimer 2nd Earl March and Philippa Montagu Countess March.
On 11th April 1374 Roger Mortimer 4th Earl March 3rd Earl of Ulster was born to Edmund Mortimer 3rd Earl March, Earl of Ulster and Philippa Plantagenet Countess March 2nd Countess Ulster at Usk, Monmouthshire.
On 27th December 1381 [his father] Edmund Mortimer 3rd Earl March, Earl of Ulster died. He was buried at Wigmore Abbey. Roger Mortimer 4th Earl March 3rd Earl of Ulster succeeded 4th Earl March, 3rd Earl of Ulster, 6th Baron Mortimer of Wigmore.
On 5th January 1382 [his mother] Philippa Plantagenet Countess March 2nd Countess Ulster died at Cork. She was buried at Wigmore, Herefordshire. Roger Mortimer 4th Earl March 3rd Earl of Ulster succeeded Heir to the Throne of England, 6th Earl of Ulster
Around 1388 [his brother-in-law] John Hastings 3rd Earl Pembroke and [his sister] Philippa Mortimer Countess Pembroke, Arundel and Surrey were married. She by marriage Countess Pembroke. She the daughter of [his father] Edmund Mortimer 3rd Earl March, Earl of Ulster and [his mother] Philippa Plantagenet Countess March 2nd Countess Ulster. He the son of John Hastings 2nd Earl Pembroke and Anne Manny Countess Pembroke.
On 7th October 1388 Roger Mortimer 4th Earl March 3rd Earl of Ulster and Eleanor Holland Countess March and Ulster were married. She by marriage Countess March, Countess of Ulster. She the daughter of Thomas Holland 2nd Earl Kent and Alice Fitzalan Countess Kent. He the son of Edmund Mortimer 3rd Earl March, Earl of Ulster and Philippa Plantagenet Countess March 2nd Countess Ulster.
After 30th December 1389 [his brother-in-law] Richard Fitzalan 9th Earl of Surrey 4th or 11th Earl of Arundel and [his sister] Philippa Mortimer Countess Pembroke, Arundel and Surrey were married. She by marriage Countess Arundel, Countess Surrey. The difference in their ages was 29 years. She the daughter of [his father] Edmund Mortimer 3rd Earl March, Earl of Ulster and [his mother] Philippa Plantagenet Countess March 2nd Countess Ulster. He the son of Richard Fitzalan 3rd or 10th Earl of Arundel 8th Earl of Surrey and Eleanor Plantagenet Countess Arundel and Surrey.
On 27th December 1390 [his daughter] Anne Mortimer was born to Roger Mortimer 4th Earl March 3rd Earl of Ulster and [his wife] Eleanor Holland Countess March and Ulster at County Westmeath. She married May 1406 Richard of Conisbrough 1st Earl Cambridge, son of Edmund of Langley 1st Duke of York and Isabella of Castile Duchess York, and had issue.
On 6th November 1391 [his son] Edmund Mortimer 5th Earl March 7th Earl of Ulster was born to Roger Mortimer 4th Earl March 3rd Earl of Ulster and [his wife] Eleanor Holland Countess March and Ulster at County Westmeath. He married 1415 Anne Stafford Duchess Exeter, daughter of Edmund Stafford 5th Earl Stafford and Anne of Gloucester Plantagenet Countess Eu and Stafford.
Before 20th October 1392 [his brother-in-law] Thomas Holland 1st Duke Surrey and Joan Stafford Countess Kent were married. She the daughter of Hugh Stafford 2nd Earl Stafford and Philippa Beauchamp Countess Stafford. He the son of [his father-in-law] Thomas Holland 2nd Earl Kent and [his mother-in-law] Alice Fitzalan Countess Kent.
Before 1393 [his brother-in-law] Henry "Hotspur" Percy and [his sister] Elizabeth Mortimer Baroness Camoys were married. She the daughter of [his father] Edmund Mortimer 3rd Earl March, Earl of Ulster and [his mother] Philippa Plantagenet Countess March 2nd Countess Ulster. He the son of Henry Percy 1st Earl of Northumberland and Margaret Neville.
On 23rd April 1393 [his son] Roger Mortimer was born to Roger Mortimer 4th Earl March 3rd Earl of Ulster and [his wife] Eleanor Holland Countess March and Ulster.
On 4th November 1393 Edmund of Langley 1st Duke of York and [his sister-in-law] Joan Holland Duchess York were married. She by marriage Duchess York. The difference in their ages was 38 years. She the daughter of [his father-in-law] Thomas Holland 2nd Earl Kent and [his mother-in-law] Alice Fitzalan Countess Kent. He the son of King Edward III of England and Philippa of Hainaut Queen Consort England.
In 1395 [his daughter] Eleanor Mortimer was born to Roger Mortimer 4th Earl March 3rd Earl of Ulster and [his wife] Eleanor Holland Countess March and Ulster. She married before 20th November 1409 Edward Courtenay, son of Edward Courtenay 3rd or 12th Earl Devon and Maud Camoys Countess Devon.
On 25th April 1397 [his father-in-law] Thomas Holland 2nd Earl Kent died. He was buried in Bourne Abbey, Lincolnshire. [his brother-in-law] Thomas Holland 1st Duke Surrey succeeded 3rd Earl Kent, 2nd Baron Holand, 7th Baron Wake of Liddell. Joan Stafford Countess Kent by marriage Countess Kent.
On 27th November 1397 John Beaufort 1st Marquess Somerset and Dorset and [his sister-in-law] Margaret Holland Duchess Clarence were married. She by marriage Countess Somerset. She the daughter of [his father-in-law] Thomas Holland 2nd Earl Kent and [his mother-in-law] Alice Fitzalan Countess Kent. He the illegitmate son of John of Gaunt 1st Duke Lancaster and Katherine Swynford aka Roet Duchess Lancaster.
In April 1398 [his brother-in-law] Thomas Poynings 5th Baron St John of Basing and [his sister] Philippa Mortimer Countess Pembroke, Arundel and Surrey were married. She by marriage Baroness St John of Basing. The difference in their ages was 24 years. She the daughter of [his father] Edmund Mortimer 3rd Earl March, Earl of Ulster and [his mother] Philippa Plantagenet Countess March 2nd Countess Ulster.
On 20th July 1398 Roger Mortimer 4th Earl March 3rd Earl of Ulster was killed. He was buried at Wigmore Abbey. [his son] Edmund Mortimer 5th Earl March 7th Earl of Ulster succeeded Heir to the Throne of England, 5th Earl March, 4th Earl of Ulster, 7th Baron Mortimer of Wigmore.
Before 19th June 1399 Edward Charleton 5th Baron Cherleton and [his former wife] Eleanor Holland Countess March and Ulster were married. She the daughter of [his former father-in-law] Thomas Holland 2nd Earl Kent and [his former mother-in-law] Alice Fitzalan Countess Kent.
In October 1405 [his former wife] Eleanor Holland Countess March and Ulster died.
Parliament Rolls Richard II. 26. William Montague, Earl of Salisbury, submitted a petition in parliament, the tenor of which follows:
To our lord the king his liege William Montague, Earl of Salisbury, prays: whereas the most noble King Edward [III], your grandfather, by his letters patent gave and granted to William Montague, Earl of Salisbury and father of the said supplicant, whose heir he is, and to the heirs issuing from his body, with the clause of warranty of the said very noble King Edward [III] and his heirs, the castle, town and honour of Denbigh, and the cantreds of Rhos, Rhufiniog, and Cymeirch and the commote of Dinmael with their appurtenances in Wales, as plainly appears from the said letters patent: which castle, town, and honour, cantreds and commote, with their appurtenances, Roger Mortimer, late Earl of March, by the name of the land of Denbigh, in Trinity term, in the twenty-eighth year of the reign of the said most noble King Edward [III] [18 June 1354-9 July 1354], before William Shareshull and his fellow justices assigned to hold the pleas before the said very noble King Edward [III], against the aforesaid supplicant, by erroneous judgment, recovered by a writ of scire facias, founded on a judgment given in the parliament held at Westminster on the Monday after the feast of St Mark the Evangelist in the twenty-eighth year of the reign of the said very noble King Edward [III], for the aforesaid Roger, on a petition showed by him to the said very noble King Edward [III] then, in the name of Roger Mortimer of Wigmore, son and heir of Edmund Mortimer, son and heir of Roger Mortimer; in which record and judgment on the said writ of scire facias there are patent errors.
May it please you of your gracious lordship to cause the full record to be brought before you, with all attachments to the same concerning the said writ of scire facias, in the present parliament, that they may be inspected and examined for error, and to forewarn Roger Mortimer, Earl of March, cousin and heir of the aforesaid Roger son of Edmund, and others who are to be forewarned in the matter, to be before you at the next parliament to hear the said errors; and if they know of anything to say wherefor the aforesaid judgment on the said writ of scire facias should not be reversed, and the aforesaid supplicant restored to his said possession with the issues and profits in the meantime since the said loss, and also to do right and justice to the parties in the aforesaid manner. Whereupon, the said petition having been read before the king and lords of parliament, the king ordered Sir Walter Clopton, his chief justice, to bring before the king and lords in parliament the record of which the said petition made mention above. Which record, on the king's command, was later brought to parliament before the king and lords, and there it was read in part, and certain errors therein were pointed out and alleged by the said Earl of Salisbury. Whereupon the king, by the assent and advice of the lords of parliament, the justices of the king there present, granted and ordered that the said earl have a writ of scire facias on the matter of the said petition, returnable at the next parliament, as the same petition mentions.
Westminster Chronicle. Also it should be observed that Lord [his grandfather] Lionel, the second son of King Edward in order of birth, took as wife the [his grandmother] heir of the earldom of Ulster and the lordship of Clare, and by her begot one [his mother] daughter1. She was joined in marriage to the [his father] earl of March, by whom the same earl raised up two sons, of whom the elder took as wife the daughter of the earl of Kent, [half] brother of the present king. To one of these brothers, indeed, by hereditary right, the kingdom of the English would come, if, God forbid, the king should die without children.
Item est attendendum quod dominus Leonellus secundus filius regis Edwardi in ordine genituræ duxit in uxorem heredem comitatus Ultoniæ et dominii de Clare genuitque ex ea unam filiam quæ fuit copulata comiti de la Marche de qua idem comes sustulit duos filios quorum senior duxit filiam comitis Cantiæ fratris regis nunce in conjugem. Ad unum istorum fratrum profecto jure hereditario deveniret regnum Anglorum si, quod absit, rex sine liberis decessisset.
Note 1. Lionel of Antwerp married Elizabeth de Burgh in 1352. In 1369 their daughter Philippa of Clarence married Edmund Mortimer, Earl of March. Their eldest son Edmund married Eleanor, daughter of Thomas Holland, Earl of Kent. It was through Roger and Eleanor's daughter Anne Mortimer who married Richard of Conisborough that their son Richard, Duke of York, claimed the throne, being descended from Lionel of Antwerp, elder brother of John of Gaunt from whom King Henry VI was descended. It was this claim that gave rise to the Wars of the Roses in 1455.