Paternal Family Tree: Reginar aka Percy
Maternal Family Tree: Alix Montmorency
In 1190 [his father] Simon "Elder" Montfort 5th Earl of Leicester [aged 15] and [his mother] Alix Montmorency were married. They were fifth cousin once removed. She a great granddaughter of King Henry I "Beauclerc" England.
Around 1208 Simon de Montfort 6th Earl of Leicester 1st Earl Chester was born to Simon "Elder" Montfort 5th Earl of Leicester [aged 33] and Alix Montmorency. He a great x 2 grandson of King Henry I "Beauclerc" England.
The Battle of Muret, the last major battle of the Albigensian Crusade, was fought on 12th September 1213 between the armies of Peter II King Aragon [aged 35] and [his father] Simon "Elder" Montfort 5th Earl of Leicester [aged 38]. The Argonese forces were heavily defeated. Peter II King Aragon was killed. His son James [aged 5] succeeded I King Aragon.
On 25th June 1218 [his father] Simon "Elder" Montfort 5th Earl of Leicester [aged 43] was killed at the Siege of Toulouse 1218. His son [his brother] Amaury [aged 23] succeeded 6th Seigneur Montfort. His son Simon [aged 10] succeeded 6th Earl of Leicester.
On 23rd April 1224 William "The Younger" Marshal 2nd Earl Pembroke [aged 34] and [his future wife] Eleanor Plantagenet Countess Pembroke and Leicester [aged 9] were married. She by marriage Countess Pembroke. The difference in their ages was 25 years. She the daughter of King John of England and [his future mother-in-law] Isabella of Angoulême Queen Consort England [aged 36]. He the son of William Marshal 1st Earl Pembroke and Isabel Clare Countess Pembroke. They were fifth cousins.
Chronica Majora by Matthew Paris. 20th January 1236. There were assembled at the [his future brother-in-law] king's [aged 28] nuptial festivities such a host of nobles of both sexes, such numbers of religious men, such crowds of the populace, and such a variety of actors, that London, with its capacious bosom, could scarcely contain them. The whole city was ornamented with flags and banners, chaplets and hangings, candles and lamps, and with wonderful devices and extraordinary representations, and all the roads were cleansed from mud and dirt, sticks, and everything offensive. The citizens, too, went out to meet the king and queen [aged 13], dressed out in their ornaments, and vied with each other in trying the speed of their horses. On the same day, when they left the city for Westminster, to perform the duties of butler to the king (which office belonged to them by right of old, at the coronation), they proceeded thither dressed in silk garments, with mantles worked in gold, and with costly changes of raiment, mounted on valuable horses, glittering with new bits and saddles, and riding in troops arranged in order. They carried with them three hundred and sixty gold and silver cups, preceded by the king's trumpeters and with horns sounding, so that such a wonderful novelty struck all who beheld it with astonishment. The archbishop of Canterbury [aged 61], by the right especially belonging to him, performed the duty of crowning, with the usual solemnities, the bishop of London assisting him as a dean, the other bishops taking their stations according to their rank. In the same way all the abbats, at the head of whom, as was his right, was the abbat of St. Alban's (for as the Protomartyr of England, St. Alban, was the chief of all the martyrs of England, so also was his abbat the chief of all the abbats in rank and dignity), as the authentic privileges of that church set forth. The nobles, too, performed the duties, which, by ancient right and custom, pertained to them at the coronations of kings. In like manner some of the inhabitants of certain cities discharged certain duties which belonged to them by right of their ancestors. The earl of Chester [aged 29] carried the sword of St. Edward, which was called "Curtein", before the king, as a sign that he was earl of the palace, and had by right the power of restraining the king if he should commit an error. The earl was attended by the constable of Chester [aged 44], and kept the people away with a wand when they pressed forward in a disorderly way. The grand marshal of England, the earl of Pembroke [aged 39], carried a wand before the king and cleared the way before him both, in the church and in the banquet-hall, and arranged the banquet and the guests at table. The Wardens of the Cinque Ports carried the pall over the king, supported by four spears, but the claim to this duty was not altogether undisputed. The earl of Leicester [aged 28] supplied the king with water in basins to wash before his meal; the Earl Warrenne performed the duty of king's Cupbearer, supplying the place of the earl of Arundel, because the latter was a youth and not as yet made a belted knight. Master Michael Belet was butler ex officio; the earl of Hereford [aged 32] performed the duties of marshal of the king's household, and William Beauchamp [aged 51] held the station of almoner. The justiciary of the forests arranged the drinking cups on the table at the king's right hand, although he met with some opposition, which however fell to the ground. The citizens of London passed the wine about in all directions, in costly cups, and those of Winchester superintended the cooking of the feast; the rest, according to the ancient statutes, filled their separate stations, or made their claims to do so. And in order that the nuptial festivities might not be clouded by any disputes, saving the right of any one, many things were put up with for the time which they left for decision at a more favourable opportunity. The office of chancellor of England, and all the offices connected with the king, are ordained and assized in the Exchequer. Therefore the chancellor, the chamberlain, the marshal, and the constable, by right of their office, took their seats there, as also did the barons, according to the date of their creation, in the city of London, whereby they each knew his own place. The ceremony was splendid, with the gay dresses of the clergy and knights who were present. The abbat of Westminster sprinkled the holy water, and the treasurer, acting the part of sub-dean, carried the Paten. Why should I describe all those persons who reverently ministered in the church to God as was their duty? Why describe the abundance of meats and dishes on the table & the quantity of venison, the variety of fish, the joyous sounds of the glee-men, and the gaiety of the waiters? Whatever the world could afford to create pleasure and magnificence was there brought together from every quarter.
In 1238 Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 30] and Eleanor Plantagenet Countess Pembroke and Leicester [aged 23] were married at Westminster Palace [Map]. She by marriage Countess of Leicester. She the daughter of King John of England and Isabella of Angoulême Queen Consort England [aged 50]. He the son of Simon "Elder" Montfort 5th Earl of Leicester and Alix Montmorency. They were half third cousins. He a great x 2 grandson of King Henry I "Beauclerc" England.
On 4th March 1238 [his sister-in-law] Joan Plantagenet Queen of Scotland [aged 27] died at Havering atte Bower, Essex [Map]. She was buried at Tarrant Abbey, Dorset [Map].
In November 1238 [his son] Henry Montfort was born to Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 30] and [his wife] Eleanor Plantagenet Countess Pembroke and Leicester [aged 23]. He a grandson of King John of England.
On 22nd June 1239 King Edward I of England was christened at Westminster Abbey [Map]. Humphrey Bohun 2nd Earl Hereford 1st Earl Essex [aged 35] was godfather. He was named after King Edward "The Confessor" of England. [his brother-in-law] Richard of Cornwall 1st Earl Cornwall [aged 30] and his uncle by marriage Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 31] were his godfathers. He was confirmed the same day.
In 1240 [his brother-in-law] Bishop Aymer de Valence [aged 18] was appointed Bishop of Winchester.
In April 1240 [his son] Simon "Younger" Montfort was born to Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 32] and [his wife] Eleanor Plantagenet Countess Pembroke and Leicester [aged 25] at Siena [Map]. He a grandson of King John of England.
In 1241 [his brother] Amaury Montfort [aged 46] died.
Chronicle of Geoffrey le Baker of Swinbroke
Baker was a secular clerk from Swinbroke, now Swinbrook, an Oxfordshire village two miles east of Burford. His Chronicle describes the events of the period 1303-1356: Gaveston, Bannockburn, Boroughbridge, the murder of King Edward II, the Scottish Wars, Sluys, Crécy, the Black Death, Winchelsea and Poitiers. To quote Herbert Bruce 'it possesses a vigorous and characteristic style, and its value for particular events between 1303 and 1356 has been recognised by its editor and by subsequent writers'. The book provides remarkable detail about the events it describes. Baker's text has been augmented with hundreds of notes, including extracts from other contemporary chronicles, such as the Annales Londonienses, Annales Paulini, Murimuth, Lanercost, Avesbury, Guisborough and Froissart to enrich the reader's understanding. The translation takes as its source the 'Chronicon Galfridi le Baker de Swynebroke' published in 1889, edited by Edward Maunde Thompson.
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On 27th June 1241 Gilbert Marshal 4th Earl Pembroke [aged 44] was killed in a tournament at Ware, Hertfordshire [Map]. He was buried at Temple Church, London [Map] next to his father. His brother Walter [aged 42] succeeded 5th Earl Pembroke; he had also attended the tournament. The King [his brother-in-law] King Henry III of England [aged 33] had expressly forbidden the tournament leading to anger at his disobeying the King's orders.
In 1242 [his son] Amaury Montfort was born to Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 34] and [his wife] Eleanor Plantagenet Countess Pembroke and Leicester [aged 27]. He a grandson of King John of England.
In 1243 Raymond Rouerge VII Count Toulouse [aged 45] and [his sister-in-law] Margaret Lusignan Countess Toulouse [aged 17] were married. She by marriage Countess Toulouse. The difference in their ages was 28 years. She the daughter of Hugh X of Lusignan V Count La Marche [aged 60] and [his mother-in-law] Isabella of Angoulême Queen Consort England [aged 55]. He the son of Raymond Count of Toulouse and Joan Plantagenet Queen Consort Sicily. They were second cousin once removed. He a grandson of King Henry "Curtmantle" II of England.
On 23rd November 1243 [his brother-in-law] Richard of Cornwall 1st Earl Cornwall [aged 34] and Sanchia Provence Queen Consort Germany [aged 15] were married at Westminster Abbey [Map]. She by marriage Countess Cornwall. She the daughter of Raymond IV Count Provence [aged 45] and Beatrice Savoy Countess Provence [aged 45]. He the son of King John of England and [his mother-in-law] Isabella of Angoulême Queen Consort England [aged 55]. They were fourth cousins.
In 1244 [his son] Guy Montfort Count Nola was born to Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 36] and [his wife] Eleanor Plantagenet Countess Pembroke and Leicester [aged 29]. He a grandson of King John of England. He married in or before 1274 Margherita Aldobrandesca and had issue.
On 4th June 1246 [his mother-in-law] Isabella of Angoulême Queen Consort England [aged 58] died at Fontevraud Abbey [Map]. Her son [his brother-in-law] Hugh [aged 25] succeeded II Count Angoulême. Yolande Capet Countess Lusignan, La Marche and Angoulême [aged 27] by marriage Countess Angoulême.
In 1247 [his brother-in-law] William de Valence 1st Earl Pembroke and Joan Munchensi Countess Pembroke [aged 17] were married. He the son of Hugh X of Lusignan V Count La Marche [aged 64] and [his mother-in-law] Isabella of Angoulême Queen Consort England.
In 1247 [his brother-in-law] William de Valence 1st Earl Pembroke was created 1st Earl Pembroke. Joan Munchensi Countess Pembroke [aged 17] by marriage Countess Pembroke.
In 1247 John Warenne 6th Earl of Surrey [aged 16] and [his sister-in-law] Alice Lusignan Countess of Surrey [aged 23] were married. She by marriage Countess Surrey. She the daughter of Hugh X of Lusignan V Count La Marche [aged 64] and [his mother-in-law] Isabella of Angoulême Queen Consort England. He the son of William Warenne 5th Earl of Surrey and Maud Marshal Countess Norfolk and Surrey [aged 53]. They were fifth cousins.
In 1248 [his son] Joanna Montfort was born to Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 40] and [his wife] Eleanor Plantagenet Countess Pembroke and Leicester [aged 33] at Bordeaux [Map]. He a grandson of King John of England. He died aged three in 1251.
On 5th June 1249 Hugh X of Lusignan V Count La Marche [aged 66] died. His son [his brother-in-law] Hugh [aged 28] succeeded XI Seigneur of Lusignan, VI Count La Marche. Yolande Capet Countess Lusignan, La Marche and Angoulême [aged 30] by marriage Seigneur of Lusignan, Countess La Marche.
On 6th April 1250 [his brother-in-law] Hugh XI of Lusignan VI Count of La Marche II Count Angoulême [aged 29] died. His son Hugh [aged 15] succeeded XII Seigneur of Lusignan, VII Count La Marche, III Count Angoulême.
The History of William Marshal was commissioned by his son shortly after William’s death in 1219 to celebrate the Marshal’s remarkable life; it is an authentic, contemporary voice. The manuscript was discovered in 1861 by French historian Paul Meyer. Meyer published the manuscript in its original Anglo-French in 1891 in two books. This book is a line by line translation of the first of Meyer’s books; lines 1-10152. Book 1 of the History begins in 1139 and ends in 1194. It describes the events of the Anarchy, the role of William’s father John, John’s marriages, William’s childhood, his role as a hostage at the siege of Newbury, his injury and imprisonment in Poitou where he met Eleanor of Aquitaine and his life as a knight errant. It continues with the accusation against him of an improper relationship with Margaret, wife of Henry the Young King, his exile, and return, the death of Henry the Young King, the rebellion of Richard, the future King Richard I, war with France, the death of King Henry II, and the capture of King Richard, and the rebellion of John, the future King John. It ends with the release of King Richard and the death of John Marshal.
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On 5th December 1250 [his brother-in-law] Bishop Aymer de Valence [aged 28] died at Paris [Map].
In 1251 [his son] Joanna Montfort [aged 3] died at Bordeaux [Map].
In 1252 [his daughter] Eleanor Montfort Princess of Wales was born to Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 44] and [his wife] Eleanor Plantagenet Countess Pembroke and Leicester [aged 37]. She a granddaughter of King John of England. She married 13th October 1278 her first cousin once removed Llywelyn "Last" Aberffraw and had issue.
On 9th February 1256 [his sister-in-law] Alice Lusignan Countess of Surrey [aged 32] died.
In 1264 Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 56] was created 1st Earl Chester. It isn't clear whether this creation took place before or after the Battle of Northampton or the Battle of Lewes.
On 6th April 1264 the future King Edward I of England [aged 24], Philip Marmion 5th Baron Marmion [aged 30] and Roger Leybourne [aged 49] fought for the King at Northampton Castle [Map] during the Battle of Northampton. Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 56] fought for the rebels with his son Simon "Younger" Montfort [aged 24] who was captured.
On 14th May 1264 the army of Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 56] including Gilbert "Red Earl" Clare 7th Earl Gloucester 6th Earl Hertford [aged 20], Henry Hastings [aged 29] and Nicholas Segrave 1st Baron Segrave [aged 26] defeated the army of [his brother-in-law] King Henry III of England [aged 56] during the Battle of Lewes at Lewes [Map].
King Henry III of England, his son, the future, King Edward I of England [aged 24], Humphrey Bohun 2nd Earl Hereford 1st Earl Essex [aged 60], Richard of Cornwall 1st Earl Cornwall [aged 55], John "Red" Comyn 1st Lord Baddenoch [aged 44], Philip Marmion 5th Baron Marmion [aged 30] and John Giffard 1st Baron Giffard Brimpsfield [aged 32] were captured. John Warenne 6th Earl of Surrey [aged 33], John Balliol [aged 56], Robert Bruce 5th Lord Annandale [aged 49], Roger Leybourne [aged 49] and William de Valence 1st Earl Pembroke fought for the King. Guy Lusignan was killed. Fulk IV Fitzwarin [aged 44] drowned. Bishop Walter de Cantelupe [aged 73] was present and blessed the Montfort army before the battle.
On 3rd August 1265 Bishop Walter de Cantelupe [aged 74] had dinner with Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 57] before the Battle of Evesham.
On 4th August 1265 the army loyal to [his brother-in-law] King Henry III of England [aged 57], led by his son the future King Edward I of England [aged 26], supported by Gilbert "Red Earl" Clare 7th Earl Gloucester 6th Earl Hertford [aged 21], Warin Basingburne and John Giffard 1st Baron Giffard Brimpsfield [aged 33] defeated the rebel army of Simon de Montfort 6th Earl of Leicester 1st Earl Chester [aged 57] at the Battle of Evesham.
Roger Leybourne [aged 50] fought and reputedly saved the King's life.
Adam Mohaut rescued the King.
Alan de Plugenet of Kilpec fought for the King.
Simon de Montfort 6th Earl of Leicester 1st Earl Chester was killed. Earl of Leicester, Earl Chester forfeit. His son Henry Montfort [aged 26] was also killed.
Hugh Despencer [aged 41] was killed by Roger Mortimer 1st Baron Mortimer of Wigmore [aged 34]. Baron Despencer extinct. It may not have been created as a hereditary barony.
Simon Beauchamp [aged 31], Ralph Basset [aged 50], William Devereux [aged 46], Hugh Troyes, Richard Trussel, Peter Montfort [aged 60], William Mandeville, William Crepping, William Birmingham, Guy Balliol and Thomas Astley [aged 50] were killed. Henry Hastings [aged 30], Humphrey Bohun [aged 44], Nicholas Segrave 1st Baron Segrave [aged 27], John Vesci, John Fitzjohn and Guy Montfort Count Nola [aged 21] were captured.
John Vesci was wounded and taken prisoner.
On 13th March 1271 Henry "Almain" Cornwall [aged 35] was murdered while attending mass at the Chiesa di San Silvestro, Viterbo by his cousins [his son] Simon "Younger" Montfort and Guy Montfort Count Nola [aged 27] in revenge for the deaths of their father Simon and older brother Henry at the Battle of Evesham.
The murder was carried out in the presence of the Cardinals, who were conducting a papal Election, King Philip III of France [aged 25], and King Charles of Sicily [aged 43]. The Montfort brothers were excommunicated.
Henry "Almain" Cornwall was buried in Hailes Abbey [Map].
The deed is mentioned by Dante Alighieri some forty years after in the Divine Comedy who placed Guy de Montfort in the seventh circle of hell.
On 13th April 1275 [his former wife] Eleanor Plantagenet Countess Pembroke and Leicester [aged 60] died at Montargis Abbey.
[his son] Richard Montfort aka Wellesburne was born to Simon de Montfort 6th Earl of Leicester 1st Earl Chester and Eleanor Plantagenet Countess Pembroke and Leicester. He a grandson of King John of England.
Chronica Majora by Matthew Paris. About the same time, Earl Richard, the king's brother, Earl G. Marshal, John, earl of Chester and Lincoln, the earl of Salisbury [Note. Unclear as to who this is referring since the last Earl of Salisbury William Longespée Earl Salisbury died in 1226 and his wife Ela of Salisbury 3rd Countess of Salisbury, de jure Earl of Salisbury, remained unmarried], G. de Lucy, his brother, Richard Seward, and many other nobles, assumed the cross. Earl Rchard at once ordered his woods to be cut down and sold, and endeavoured by all the means in his power to raise money to sustain his pilgrimage. Not long afterwards, by means of Simon de Montfort, earl of Leicester, and (as was reported) Peter de Eivaulx, Richard Seward unjustly incurred the king's anger, and was taken and imprisoned; but was soon afterwards released with the same ease.
Kings Wessex: Great x 10 Grand Son of King Alfred "The Great" of Wessex
Kings England: Great x 2 Grand Son of King Henry I "Beauclerc" England
Kings France: Great x 6 Grand Son of Hugh I King of the Franks
Kings Duke Aquitaine: Great x 10 Grand Son of Ranulf I Duke Aquitaine
Great x 4 Grandfather: Aumary Reginarids
Great x 3 Grandfather: Simon Montfort
Great x 4 Grandmother: Bertrade Unknown
Great x 2 Grandfather: Amaury Montfort Count Évreux
Great x 4 Grandfather: Richard Normandy 2nd Count Évreux 
Great x 3 Grandmother: Agnès of Normandy
Great x 4 Grandmother: Adelaide aka Godehildis Ramon
Great x 1 Grandfather: Simon "Chauve" Montfort 4th Count Évreux
Grandfather: Simon Montfort
Great x 1 Grandmother: Mathilde Unknown Countess Évreux
father: Simon "Elder" Montfort 5th Earl of Leicester 6 x Great Grandson of Hugh I King of the Franks
Great x 4 Grandfather: Roger "Bearded" Beaumont 
Great x 3 Grandfather: Robert Beaumont 1st Earl of Leicester Count Meulan
Great x 4 Grandmother: Adeline of Meulan
Great x 2 Grandfather: Robert Beaumont 2nd Earl of Leicester 3 x Great Grandson of Hugh I King of the Franks
Great x 4 Grandfather: Hugh "Great" Capet 
Great Grandson of Hugh I King of the Franks
Great x 3 Grandmother: Elizabeth Capet Countess Leicester, Meulan and Surrey 2 x Great Granddaughter of Hugh I King of the Franks
Great x 4 Grandmother: Adelaide I Countess Vermandois 8 x Great Granddaughter of Charles "Charlemagne aka Great" King of the Franks King Lombardy Holy Roman Emperor
Great x 1 Grandfather: Robert Beaumont 3rd Earl of Leicester 4 x Great Grandson of Hugh I King of the Franks
Great x 4 Grandfather: Ralph de Gael 2nd Earl East Anglia
Great x 3 Grandfather: Raoul Gael
Great x 4 Grandmother: Emma Fitzosbern Countess East Anglia
Great x 2 Grandmother: Amice Gael Countess Leicester
Grandmother: Amicia Beaumont 5 x Great Granddaughter of Hugh I King of the Franks
Great x 4 Grandfather: Hugh Grandesmil
Great x 3 Grandfather: Robert Grandesmil
Great x 4 Grandmother: Adelize Beaumont Oise
Great x 2 Grandfather: William Grandesmil
Great x 1 Grandmother: Petronilla Grandesmil Countess Leicester
Simon de Montfort 6th Earl of Leicester 1st Earl Chester 2 x Great Grandson of King Henry I "Beauclerc" England
Great x 1 Grandfather: Mathieu I Montmorency
Grandfather: Bouchard V Montmorency Grandson of King Henry I "Beauclerc" England
Great x 4 Grandfather: Robert "Magnificent" Normandy I Duke Normandy 8 x Great Grandson of Charles "Charlemagne aka Great" King of the Franks King Lombardy Holy Roman Emperor
Great x 3 Grandfather: King William "Conqueror" I of England -2 x Great Grandson of King William "Conqueror" I of England
Great x 4 Grandmother: Herleva of Falaise
Great x 2 Grandfather: King Henry I "Beauclerc" England son of King William "Conqueror" I of England
Great x 4 Grandfather: Baldwin "The Good" V Count Flanders 4 x Great Grandson of King Alfred "The Great" of Wessex
Great x 3 Grandmother: Matilda Flanders Queen Consort England Great Granddaughter of Hugh I King of the Franks
Great x 4 Grandmother: Adela Capet Duchess Normandy Granddaughter of Hugh I King of the Franks
Great x 1 Grandmother: Aline Fitzroy daughter of King Henry I "Beauclerc" England
mother: Alix Montmorency Great Granddaughter of King Henry I "Beauclerc" England