Arthur Montfort III Duke Brittany 1393-1458

Paternal Family Tree: Capet

Maternal Family Tree: Mathilda of Tubingen

Around 3rd July 1361 [his father] John Montfort V Duke Brittany [aged 22] and Mary Plantagenet Duchess Brittany [aged 16] were married. She the daughter of King Edward III of England [aged 48] and Philippa of Hainaut Queen Consort England [aged 51]. They were third cousins. He a great x 2 grandson of King Henry III of England.

In May 1366 [his father] John Montfort V Duke Brittany [aged 27] and Joan Holland Duchess Brittany [aged 16] were married. She by marriage Duchess Brittany 1221 Dreux. She the daughter of Thomas Holland 1st Earl Kent and Joan "Fair Maid of Kent" Princess Wales [aged 37]. They were third cousins. He a great x 2 grandson of King Henry III of England. She a great granddaughter of King Edward I of England.

On 2nd October 1386 John Montfort V Duke Brittany [aged 47] and Joanna of Navarre Queen Consort England [aged 16] were married at Saillé [Map]. She by marriage Duchess Brittany 1221 Dreux, Countess Richmond. His third marriage, her first. The marriage proceeded when her father Charles "Bad" II King Navarre [aged 53] agreed to give his daughter 120,000 gold francs and to pay 6,000 francs owed to John, duke of Brittany, for the rent of certain lands. He, John, gave her the cities of Nantes [Map] and Guerrand [Map]. The difference in their ages was 31 years. She the daughter of Charles "Bad" II King Navarre and Joan Valois Queen Consort Navarre. They were second cousin twice removed. He a great x 2 grandson of King Henry III of England. She a great x 4 granddaughter of King Henry III of England.

On 24th August 1393 Arthur Montfort III Duke Brittany was born to John Montfort V Duke Brittany [aged 54] and Joanna of Navarre Queen Consort England [aged 23]. He a great x 3 grandson of King Henry III of England.

In 1396 [his brother-in-law] John Valois I Duke Alençon and [his sister] Marie Montfort Duchess Alençon [aged 4] were married. She the daughter of [his father] John Montfort V Duke Brittany [aged 57] and [his mother] Joanna of Navarre Queen Consort England [aged 26]. He the son of Peter Valois II Count Alençon [aged 56] and Marie Chamaillart Countess Alençon. They were second cousin twice removed. She a great x 3 granddaughter of King Henry III of England.

In August 1396 [his brother] John Montfort V Duke Brittany [aged 6] and [his sister-in-law] Joan Valois Duchess Brittany [aged 5] were married. She by marriage Duchess Brittany 1341 War of Sucession. She the daughter of Charles "Beloved Mad" VI King France [aged 27] and Isabeau of Bavaria Queen Consort France [aged 26]. He the son of [his father] John Montfort V Duke Brittany [aged 57] and [his mother] Joanna of Navarre Queen Consort England [aged 26]. They were second cousins. He a great x 3 grandson of King Henry III of England. She a great x 5 granddaughter of King Henry III of England.

On 1st November 1399 [his father] John Montfort V Duke Brittany [aged 60] died. His son [his brother] John [aged 9] succeeded V Duke Brittany 1221 Dreux. His son Arthur [aged 6] succeeded 7th Earl Richmond.

On 7th February 1403 [his step-father] King Henry IV of England [aged 35] and [his mother] Joanna of Navarre Queen Consort England [aged 33] were married at Winchester, Hampshire [Map]. His third marriage, her second. She had eight children with her first husband but, despite ten years of marriage, none with Henry. She the daughter of [his grandfather] Charles "Bad" II King Navarre and [his grandmother] Joan Valois Queen Consort Navarre. He the son of John of Gaunt 1st Duke Lancaster and Blanche Duchess of Lancaster. They were third cousins. He a grandson of King Edward III of England. She a great x 4 granddaughter of King Henry III of England.

On 26th February 1403 [his mother] Joanna of Navarre Queen Consort England [aged 33] was crowned Queen Consort England at Westminster Abbey.

On 26th November 1405 Thomas Fitzalan 10th Earl of Surrey 5th or 12th Earl of Arundel [aged 24] and Beatrice Aviz Duchess Exeter [aged 23] were married. [his step-father] King Henry IV of England [aged 38] and [his mother] Joanna of Navarre Queen Consort England [aged 35] were present at their wedding feast. She the illegitmate daughter of King John I of Portugal [aged 53] and Ines Peres. He the son of Richard Fitzalan 9th Earl of Surrey 4th or 11th Earl of Arundel and Elizabeth Bohun Countess Arundel and Surrey. They were half fourth cousin once removed. He a great x 2 grandson of King Edward I of England.

On 16th June 1407 [his brother-in-law] John IV Count Armagnac [aged 10] and [his sister] Blanche Montfort Countess Armagnac [aged 10] were married. She the daughter of [his father] John Montfort V Duke Brittany and [his mother] Joanna of Navarre Queen Consort England [aged 37]. He the son of Bernard VII Count Armagnac [aged 44] and Bonne Valois Countess Armagnac and Savoy [aged 42]. They were second cousins. She a great x 3 granddaughter of King Henry III of England.

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The Chronicle of Jean le Bel, Volume 2 continues one of the most important fourteenth-century accounts of the early Hundred Years’ War. Written by the Liège chronicler Jean le Bel, this vivid narrative follows the fortunes of Edward III, Jean II of France, the Black Prince, the great nobles of France and England, and the soldiers, captains and companies who shaped the conflict. This volume covers some of the most dramatic events of the period, including the battles of Crécy and Poitiers, the siege and capture of Calais, the captivity of King John, the rise of the Jacquerie, the turmoil in Paris under Étienne Marcel and Charles of Navarre, the devastation caused by the free companies, Edward III’s great campaign of 1359–1360, and the negotiations leading to the Treaty of Brétigny. Jean le Bel’s chronicle is especially valuable for its lively detail, its interest in chivalry, warfare, politics and reputation, and its influence on later chroniclers, most famously Froissart. This English translation presents the text in clear, readable British English while preserving the force and character of the original narrative. The translation includes extensive notes to help the reader better understand Jean le Bel's text. Volume 2 also includes translated appendices drawn from royal and administrative records, many from the English Record Office, which illuminate Edward III’s campaigns in Brittany, the siege and occupation of Calais, naval preparations, military finance, appointments, safe conducts and related affairs.

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In 1414 [his brother-in-law] John Valois I Duke Alençon was created I Duke Alençon. [his sister] Marie Montfort Duchess Alençon [aged 22] by marriage Duchess Alençon.

On 12th June 1418 Bernard VII Count Armagnac [aged 55] died. His son [his brother-in-law] John [aged 21] succeeded IV Count Armagnac. [his sister] Blanche Montfort Countess Armagnac [aged 21] by marriage Countess Armagnac.

Before 1419 [his sister] Blanche Montfort Countess Armagnac [aged 21] died.

On 10th October 1423 Arthur Montfort III Duke Brittany [aged 30] and Margaret Valois [aged 29] were married at Dijon. She the daughter of John "Fearless" Valois Duke Burgundy and Margaret Wittelsbach Duchess Burgundy. He the son of John Montfort V Duke Brittany and Joanna of Navarre Queen Consort England [aged 53]. They were second cousins. He a great x 3 grandson of King Henry III of England. She a great x 4 granddaughter of King Edward I of England.

On 30th November 1424 [his brother-in-law] Philip "Good" Valois III Duke Burgundy [aged 28] and Bonne Artois Duchess Burgundy [aged 28] were married. She by marriage Duchess Burgundy. She the daughter of Philip Artois Count of Eu and Marie Valois I Duchess Auverge [aged 49]. He the son of John "Fearless" Valois Duke Burgundy and Margaret Wittelsbach Duchess Burgundy. They were second cousins. He a great x 4 grandson of King Edward I of England. She a great x 4 granddaughter of King Henry III of England.

On 7th January 1430 [his brother-in-law] Philip "Good" Valois III Duke Burgundy [aged 33] and Isabella Aviz Duchess Burgundy [aged 32] were married. She by marriage Duchess Burgundy. She the daughter of King John I of Portugal [aged 78] and Philippa of Lancaster Queen Consort Portugal. He the son of John "Fearless" Valois Duke Burgundy and Margaret Wittelsbach Duchess Burgundy. They were third cousins. He a great x 4 grandson of King Edward I of England. She a great granddaughter of King Edward III of England.

On 13th November 1432 [his sister-in-law] Anne Valois Duchess of Bedford [aged 28] died at the Hôtel de Bourbon, Paris. She was buried at the Couvent des Célestins. In 1847 bones and other remains, with a plaque bearing her name, were found during archeological exploration of the Couvent, were identified as being those of Anne. In 1853, these remains were re-buried in the grave of her grandfather, Philip the Bold, in Saint Bégnine cathedral in Dijon. Her husband John Lancaster 1st Duke Bedford [aged 43] remarried Jacquetta of Luxembourg Duchess Bedford [aged 17] six months later.

On 10th June 1437 [his mother] Joanna of Navarre Queen Consort England [aged 67] died at Havering atte Bower, Essex [Map].

In February 1442 [his wife] Margaret Valois [aged 48] died.

On 29th August 1442 Arthur Montfort III Duke Brittany [aged 49] and Jeanne Albret were married at Nérac. He the son of John Montfort V Duke Brittany and Joanna of Navarre Queen Consort England. They were second cousin once removed. He a great x 3 grandson of King Henry III of England.

On 29th August 1442 [his brother] John Montfort V Duke Brittany [aged 52] died. His son [his nephew] Francis [aged 28] succeeded I Duke Brittany.

The Deeds of the Dukes of Normandy

The Gesta Normannorum Ducum [The Deeds of the Dukes of Normandy] is a landmark medieval chronicle tracing the rise and fall of the Norman dynasty from its early roots through the pivotal events surrounding the Norman Conquest of England. Originally penned in Latin by the monk William of Jumièges shortly before 1060 and later expanded at the behest of William the Conqueror, the work chronicles the deeds, politics, battles, and leadership of the Norman dukes, especially William’s own claim to the English throne. The narrative combines earlier historical sources with firsthand information and oral testimony to present an authoritative account of Normandy’s transformation from a Viking settlement into one of medieval Europe’s most powerful realms. William’s history emphasizes the legitimacy, military prowess, and governance of the Norman line, framing their expansion, including the conquest of England, as both divinely sanctioned and noble in purpose. Later chroniclers such as Orderic Vitalis and Robert of Torigni continued the history, extending the coverage into the 12th century, providing broader context on ducal rule and its impact. Today this classic work remains a foundational source for understanding Norman identity, medieval statesmanship, and the historical forces that reshaped England and Western Europe between 800AD and 1100AD.

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On 2nd July 1445 Arthur Montfort III Duke Brittany [aged 51] and Catherine Luxembourg were married. She the daughter of Peter Luxembourg I Count Saint Pol and Margherita Baux [aged 51]. He the son of John Montfort V Duke Brittany and Joanna of Navarre Queen Consort England. They were third cousin twice removed. He a great x 3 grandson of King Henry III of England. She a great x 5 granddaughter of King Henry III of England.

On 18th December 1446 [his sister] Marie Montfort Duchess Alençon [aged 55] died.

On 9th May 1448 Richard Woodville 1st Earl Rivers [aged 43] was created 1st Baron Rivers by King Henry VI of England and II of France [aged 26]. [his sister-in-law] Jacquetta of Luxembourg Duchess Bedford [aged 33] by marriage Baroness Rivers.

On 15th April 1450 the Battle of Formigny was a decisive victory for the French that destroyed the England's last army in France bringing to end English control of Normandy.

Charles Bourbon I Duke Bourbon [aged 49] and Arthur Montfort III Duke Brittany [aged 56] commanded the French. The English commander Thomas Kyriell [aged 54] was captured.

The battle is considered to be one of the first where cannon played a decisive role.

In 1457 [his nephew] Peter Montfort II Duke Brittany [aged 39] died. His uncle Arthur [aged 63] succeeded III Duke Brittany.

On 26th December 1458 Arthur Montfort III Duke Brittany [aged 65] died. Earl Richmond extinct.

In 1492 [his former wife] Catherine Luxembourg died.

Arthur Montfort III Duke Brittany appears on the following Descendants Family Trees:

Royal Ancestors of Arthur Montfort III Duke Brittany 1393-1458

Kings Wessex: Great x 10 Grand Son of King Edmund "Ironside" I of England

Kings Godwinson: Great x 11 Grand Son of King Harold II of England

Kings England: Great x 3 Grand Son of King Henry III of England

Kings Scotland: Great x 8 Grand Son of King Malcolm III of Scotland

Kings France: Great Grand Son of King John "The Good" II of France

Kings Duke Aquitaine: Great x 14 Grand Son of Ranulf I Duke Aquitaine

Kings Spain: Great x 6 Grand Son of Alfonso II King Aragon

Ancestors of Arthur Montfort III Duke Brittany 1393-1458

Great x 4 Grandfather: Peter of Dreux aka Mauclerc Duke Brittany 5 x Great Grandson of Hugh I King of the Franks

Great x 3 Grandfather: John "The Red" Capet I Duke Brittany 3 x Great Grandson of King David I of Scotland

Great x 4 Grandmother: Alix Thouars Duchess of Brittany 2 x Great Granddaughter of King David I of Scotland

Great x 2 Grandfather: John II Duke Brittany 3 x Great Grandson of Alfonso VII King Castile VII King Leon

Great x 4 Grandfather: Theobald IV King Navarre Great Grandson of Alfonso VII King Castile VII King Leon

Great x 3 Grandmother: Blanche "Navarre" Blois Duchess Brittany 2 x Great Granddaughter of Alfonso VII King Castile VII King Leon

Great x 4 Grandmother: Agnes of Beaujeu Countess Savoy

Great x 1 Grandfather: Arthur II Duke Brittany Grandson of King Henry III of England

Great x 4 Grandfather: King John of England son of King Henry "Curtmantle" II of England

Great x 3 Grandfather: King Henry III of England son of King John of England

Great x 4 Grandmother: Isabella of Angoulême Queen Consort England 5 x Great Granddaughter of Hugh I King of the Franks

Great x 2 Grandmother: Beatrice Plantagenet daughter of King Henry III of England

Great x 4 Grandfather: Raymond IV Count Provence Grandson of Alfonso II King Aragon

Great x 3 Grandmother: Eleanor of Provence Queen Consort England Great Granddaughter of Alfonso II King Aragon

Great x 4 Grandmother: Beatrice Savoy Countess Provence 13 x Great Granddaughter of Charles "Charlemagne aka Great" King of the Franks King Lombardy Holy Roman Emperor

Grandfather: John Montfort IV Duke Brittany Great Grandson of King Henry III of England

Great x 4 Grandfather: Robert Capet III Count Dreux 5 x Great Grandson of Hugh I King of the Franks

Great x 3 Grandfather: John Capet I Count Dreux 6 x Great Grandson of Hugh I King of the Franks

Great x 4 Grandmother: Aénor de Saint-Valéry 7 x Great Granddaughter of Hugh I King of the Franks

Great x 2 Grandfather: Robert Capet IV Count Dreux 7 x Great Grandson of Hugh I King of the Franks

Great x 4 Grandfather: Archambaud "Great" Dampierre

Great x 3 Grandmother: Marie Dampierre Countess Dreux

Great x 4 Grandmother: Beatrice Montluçon

Great x 1 Grandmother: Yolande of Dreux Queen of Scotland 5 x Great Granddaughter of King Henry I "Beauclerc" England

Great x 4 Grandfather: Amaury Montfort 2 x Great Grandson of King Henry I "Beauclerc" England

Great x 3 Grandfather: Jean Montfort 3 x Great Grandson of King Henry I "Beauclerc" England

Great x 4 Grandmother: Beatrix Viennois

Great x 2 Grandmother: Beatrice Montfort Countess Dreux 4 x Great Granddaughter of King Henry I "Beauclerc" England

Great x 3 Grandmother: Jeanne Chateaudun

Great x 4 Grandmother: Clemence Roches Countess Blois

Father: John Montfort V Duke Brittany 2 x Great Grandson of King Henry III of England

Great x 4 Grandfather: William Dampierre II Count Flanders

Great x 3 Grandfather: Guy Dampierre Count Flanders 4 x Great Grandson of King William "Conqueror" I of England

Great x 4 Grandmother: Margaret II Countess Flanders 3 x Great Granddaughter of King William "Conqueror" I of England

Great x 2 Grandfather: Robert Dampierre III Count Flanders 5 x Great Grandson of King William "Conqueror" I of England

Great x 4 Grandfather: Robert VII Lord Bethune

Great x 3 Grandmother: Mathilde Bethune

Great x 1 Grandfather: Louis Dampierre I Count Nevers 6 x Great Grandson of King William "Conqueror" I of England

Great x 4 Grandfather: Hugh IV Duke Burgundy 4 x Great Grandson of King William "Conqueror" I of England

Great x 3 Grandfather: Odo Burgundy 5 x Great Grandson of King William "Conqueror" I of England

Great x 4 Grandmother: Yolande Capet Duchess Burgundy 6 x Great Granddaughter of Hugh I King of the Franks

Great x 2 Grandmother: Yolande Burgundy II Countess Nevers and Flanders 6 x Great Granddaughter of King William "Conqueror" I of England

Great x 4 Grandfather: Archambaud "Young" Dampierre

Great x 3 Grandmother: Matilda Countess of Auxerre

Great x 4 Grandmother: Yolande Chatillon

Grandmother: Joanna of Flanders Duchess Brittany 7 x Great Granddaughter of King William "Conqueror" I of England

Great x 4 Grandfather: Hugh Rethel II Count Rethel 8 x Great Grandson of King Edward "Elder" of the Anglo Saxons

Great x 3 Grandfather: Manasses V Count Rethel 9 x Great Grandson of King Edward "Elder" of the Anglo Saxons

Great x 2 Grandfather: Hugh IV Count Rethel 10 x Great Grandson of King Edward "Elder" of the Anglo Saxons

Great x 1 Grandmother: Joan Rethel Countess Nevers and Rethel 11 x Great Granddaughter of King Edward "Elder" of the Anglo Saxons

Arthur Montfort III Duke Brittany Great Grandson of King John "The Good" II of France

Great x 4 Grandfather: King Louis IX of France son of King Louis VIII of France

Great x 3 Grandfather: King Philip III of France son of King Louis IX of France

Great x 4 Grandmother: Margaret Provence Queen Consort France Great Granddaughter of Alfonso II King Aragon

Great x 2 Grandfather: Louis I Count Évreux son of King Philip III of France

Great x 4 Grandfather: Henry Reginar III Duke Brabant 2 x Great Grandson of King Stephen I England

Great x 3 Grandmother: Maria of Brabant Queen Consort France 3 x Great Granddaughter of King Stephen I England

Great x 4 Grandmother: Adelaide Burgundy Duchess Brabant 5 x Great Granddaughter of King William "Conqueror" I of England

Great x 1 Grandfather: Philip "Noble" III King Navarre Grandson of King Philip III of France

Great x 4 Grandfather: Robert Artois II Count Artois Grandson of King Louis VIII of France

Great x 3 Grandfather: Philip Artois Great Grandson of King Louis VIII of France

Great x 4 Grandmother: Amice Countenay Countess Artois 4 x Great Granddaughter of King Henry I "Beauclerc" England

Great x 2 Grandmother: Margaret Artois Countess Évreux Great Granddaughter of King Henry III of England

Great x 4 Grandfather: John II Duke Brittany 3 x Great Grandson of Alfonso VII King Castile VII King Leon

Great x 3 Grandmother: Blanche Capet Granddaughter of King Henry III of England

Great x 4 Grandmother: Beatrice Plantagenet daughter of King Henry III of England

Grandfather: Charles "Bad" II King Navarre Grandson of Louis X King France I Navarre

Great x 4 Grandfather: King Philip III of France son of King Louis IX of France

Great x 3 Grandfather: King Philip IV of France son of King Philip III of France

Great x 4 Grandmother: Isabella Barcelona Queen Consort France Great Granddaughter of Alfonso II King Aragon

Great x 2 Grandfather: Louis X King France I Navarre son of King Philip IV of France

Great x 4 Grandfather: Henry I King Navarre 2 x Great Grandson of Alfonso VII King Castile VII King Leon

Great x 3 Grandmother: Joan Blois I Queen Navarre Great Granddaughter of King Louis VIII of France

Great x 4 Grandmother: Blanche Capet Queen Navarre Granddaughter of King Louis VIII of France

Great x 1 Grandmother: Joan Capet II Queen Navarre daughter of Louis X King France I Navarre

Great x 4 Grandfather: Hugh IV Duke Burgundy 4 x Great Grandson of King William "Conqueror" I of England

Great x 3 Grandfather: Robert II Duke Burgundy 5 x Great Grandson of King William "Conqueror" I of England

Great x 4 Grandmother: Yolande Capet Duchess Burgundy 6 x Great Granddaughter of Hugh I King of the Franks

Great x 2 Grandmother: Margaret of Burgundy Queen Consort France Granddaughter of King Louis IX of France

Great x 4 Grandfather: King Louis IX of France son of King Louis VIII of France

Great x 3 Grandmother: Agnes Capet Duchess Burgundy daughter of King Louis IX of France

Great x 4 Grandmother: Margaret Provence Queen Consort France Great Granddaughter of Alfonso II King Aragon

Mother: Joanna of Navarre Queen Consort England Granddaughter of King John "The Good" II of France

Great x 4 Grandfather: King Philip III of France son of King Louis IX of France

Great x 3 Grandfather: Charles Valois I Count Valois son of King Philip III of France

Great x 4 Grandmother: Isabella Barcelona Queen Consort France Great Granddaughter of Alfonso II King Aragon

Great x 2 Grandfather: King Philip "Fortunate" VI of France Grandson of King Philip III of France

Great x 4 Grandfather: Charles II King Naples Grandson of King Louis VIII of France

Great x 3 Grandmother: Margaret Capet Countess Valois Great Granddaughter of King Louis VIII of France

Great x 4 Grandmother: Mary of Hungary Queen Consort Naples 6 x Great Granddaughter of King Harold II of England

Great x 1 Grandfather: King John "The Good" II of France son of King Philip "Fortunate" VI of France

Great x 4 Grandfather: Hugh IV Duke Burgundy 4 x Great Grandson of King William "Conqueror" I of England

Great x 3 Grandfather: Robert II Duke Burgundy 5 x Great Grandson of King William "Conqueror" I of England

Great x 4 Grandmother: Yolande Capet Duchess Burgundy 6 x Great Granddaughter of Hugh I King of the Franks

Great x 2 Grandmother: Joan "Lame" Burgundy Queen Consort France Granddaughter of King Louis IX of France

Great x 4 Grandfather: King Louis IX of France son of King Louis VIII of France

Great x 3 Grandmother: Agnes Capet Duchess Burgundy daughter of King Louis IX of France

Great x 4 Grandmother: Margaret Provence Queen Consort France Great Granddaughter of Alfonso II King Aragon

Grandmother: Joan Valois Queen Consort Navarre daughter of King John "The Good" II of France

Great x 4 Grandfather: Henry Luxembourg VI Count Luxembourg 5 x Great Grandson of King William "Conqueror" I of England

Great x 3 Grandfather: Henry Luxembourg VII Holy Roman Emperor 5 x Great Grandson of King William "Conqueror" I of England

Great x 4 Grandmother: Beatrice Avesnes Countess Luxembourg 4 x Great Granddaughter of King William "Conqueror" I of England

Great x 2 Grandfather: King John I of Bohemia 6 x Great Grandson of King William "Conqueror" I of England

Great x 4 Grandfather: John I Brabant

Great x 3 Grandmother: Margaret Brabant Countess Luxembourg and Namur

Great x 1 Grandmother: Bonne Luxembourg Queen Consort France 7 x Great Granddaughter of King William "Conqueror" I of England

Great x 4 Grandfather: Ottokar "Iron King" II King Bohemia 5 x Great Grandson of King Harold II of England

Great x 3 Grandfather: King Wenceslaus II of Bohemia and Poland 6 x Great Grandson of King Harold II of England

Great x 4 Grandmother: Kunigunda Rostislavna Přemyslovna

Great x 2 Grandmother: Queen Elizabeth of Bohemia 7 x Great Granddaughter of King Harold II of England

Great x 4 Grandfather: Rudolph I King Romans 11 x Great Grandson of King Alfred "The Great" of Wessex

Great x 3 Grandmother: Queen Judith of Bohemia and Poland 12 x Great Granddaughter of King Alfred "The Great" of Wessex

Great x 4 Grandmother: Gertrude Hohenburg