Biography of Arthur Montfort III Duke Brittany 1393-1458
Paternal Family Tree: Capet
Maternal Family Tree: Mathilda of Tubingen
On 16 Sep 1345 [his grandfather] John Montfort IV Duke Brittany (age 50) died at Hennebont. His son [his father] John Montfort V Duke Brittany (age 6) succeeded V Duke Brittany 1221 Dreux. Mary Plantagenet Duchess Brittany by marriage Duchess Brittany 1221 Dreux.
Around 03 Jul 1361 [his father] John Montfort V Duke Brittany (age 22) and Mary Plantagenet Duchess Brittany (age 16) were married. She the daughter of King Edward III of England (age 48) and Philippa of Hainault Queen Consort England (age 47). 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 (age 27) and Joan Holland Duchess Brittany (age 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 (age 37). They were third cousins. He a great x 2 grandson of King Henry III of England. She a great granddaughter of King Edward "Longshanks" I of England. 
In 1372 [his father] John Montfort V Duke Brittany (age 33) succeeded 6th Earl Richmond. Joan Holland Duchess Brittany (age 22) by marriage Countess Richmond.
On 02 Oct 1386 [his father] John Montfort V Duke Brittany (age 47) and [his mother] Joanna of Navarre Queen Consort England (age 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 [his grandfather] Charles "Bad" II King Navarre (age 53) agreed to give his daughter 120,000 gold francs and to pay 6,000 francs owed to John, duke of Brittany (age 47), 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 (age 53) 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 24 Aug 1393 Arthur Montfort III Duke Brittany was born to John Montfort V Duke Brittany (age 54) and Joanna of Navarre Queen Consort England (age 23). He a great x 3 grandson of King Henry III of England.
On 01 Nov 1399 [his father] John Montfort V Duke Brittany (age 60) died. His son [his brother] John Montfort V Duke Brittany (age 9) succeeded V Duke Brittany 1221 Dreux.
On 07 Feb 1403 [his step-father] King Henry IV of England (age 35) and [his mother] Joanna of Navarre Queen Consort England (age 33) were married at Winchester, Hampshire [Map]. Joanna of Navarre Queen Consort England (age 33) was crowned Queen Consort England. 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 Charles "Bad" II King Navarre and Joan Valois Queen Consort Navarre. He the son of John of Gaunt 1st Duke Lancaster and Blanche Plantagenet Duchess 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 10 Oct 1423 Arthur Montfort III Duke Brittany (age 30) and Margaret Valois (age 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 (age 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 "Longshanks" I of England. 
On 10 Jun 1437 [his mother] Joanna of Navarre Queen Consort England (age 67) died at Havering atte Bower [Map].
In Feb 1442 [his wife] Margaret Valois (age 48) died.
On 29 Aug 1442 Arthur Montfort III Duke Brittany (age 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 02 Jul 1445 Arthur Montfort III Duke Brittany (age 51) and Catherine Luxemburg were married. She the daughter of Peter Luxemburg I Count Saint Pol and Margherita Baux (age 51). He the son of John Montfort V Duke Brittany and Joanna of Navarre Queen Consort England. 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 15 Apr 1450 the Battle of Formigny was a descisive 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 (age 49) and Arthur Montfort III Duke Brittany (age 56) commanded the French. The English commander Thomas Kyriell (age 54) was captured.
The battle is considered to be one of the first where cannon played a decisive role.
In 1457 Peter Montfort II Duke Brittany (age 39) died. His uncle Arthur Montfort III Duke Brittany (age 63) succeeded III Duke Brittany 1364 War of Montfort.
On 26 Dec 1458 Arthur Montfort III Duke Brittany (age 65) died.
In 1492 [his former wife] Catherine Luxemburg died.
Louis Valois and Margaret Valois were married. She the daughter of John "Fearless" Valois Duke Burgundy and Margaret Wittelsbach Duchess Burgundy. He the son of Charles "Beloved Mad" VI King France and Isabeau Wittelsbach Queen Consort France. They were second cousins. He a great x 5 grandson of King Henry III of England. She a great x 4 granddaughter of King Edward "Longshanks" I of England.
Jean Albret and Catherine Rohan were married.
Kings Wessex: Great x 10 Grand Son of King Edmund "Ironside" I of England
Kings England: Great x 3 Grand Son of King Henry III of England
Kings Scotland: Great x 8 Grand Son of Malcolm III King Scotland
Kings Franks: Great x 7 Grand Son of Louis VII King Franks
Kings France: Great x 2 Grand Son of Louis X King France I Navarre
Great x 4 Grandfather: Peter of Dreux aka Mauclerc Duke Brittany
Great x 3 Grandfather: John "The Red" Capet I Duke Brittany 4 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandmother: Alix Thouars Duchess of Brittany 3 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 2 Grandfather: John Capet II Duke Brittany 5 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandfather: Theobald IV King Navarre
3 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandmother: Blanche "Navarre" Blois Duchess Brittany 4 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandmother: Agnes of Beaujeu Countess Savoy
Great x 1 Grandfather: Arthur Capet Duke Brittany Grand Son of King Henry III of England
Great x 4 Grandfather: King John "Lackland" of England Son of King Henry "Curtmantle" II of England
Great x 3 Grandfather: King Henry III of England Son of King John "Lackland" of England
Great x 4 Grandmother: Isabella of Angoulême Queen Consort England
Great x 2 Grandmother: Beatrice Plantagenet Daughter of King Henry III of England
Great x 4 Grandfather: Raymond Berenguer Provence IV Count Provence
Great x 3 Grandmother: Eleanor of Provence Queen Consort England
Great x 4 Grandmother: Beatrice Savoy Countess Provence
GrandFather: John Montfort IV Duke Brittany Great Grand Son of King Henry III of England
Great x 4 Grandfather: Robert Capet III Count Dreux
Great x 3 Grandfather: John Capet I Count Dreux
Great x 4 Grandmother: Aénor de Saint-Valéry
Great x 2 Grandfather: Robert Capet IV Count Dreux
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 Capet Duchess Brittany 5 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandfather: Amaury Montfort 2 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandfather: Jean Montfort 3 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandmother: Beatrix Viennois
Great x 2 Grandmother: Beatrice Montfort Countess Dreux 4 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandfather: Geoffrey Chateaudun VI Viscount Châteaudun
Great x 3 Grandmother: Jeanne Chateaudun
Great x 4 Grandmother: Clemence Roches Countess Blois
Father: John Montfort V Duke Brittany 2 x Great Grand Son 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 Grand Son of King William "Conqueror" I of England
Great x 4 Grandmother: Margaret II Countess Flanders 3 x Great Grand Daughter of King William "Conqueror" I of England
Great x 2 Grandfather: Robert Dampierre III Count Flanders 5 x Great Grand Son 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 Grand Son of King William "Conqueror" I of England
Great x 4 Grandfather: Hugh IV Duke Burgundy 4 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandfather: Odo Burgundy 5 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandmother: Yolande Capet Duchess Burgundy
Great x 2 Grandmother: Yolande Burgundy II Countess Nevers and Flanders 6 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Archambaud "Young" Dampierre
Great x 3 Grandmother: Matilda Dampierre
Great x 4 Grandmother: Yolande Chatillon
GrandMother: Joanna Dampierre Duchess Brittany 7 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Hugh Rethel II Count Rethel
Great x 3 Grandfather: Manasses V Count Rethel
Great x 2 Grandfather: Hugh IV Count Rethel
Great x 1 Grandmother: Joan Rethel Countess Nevers and Rethel
Arthur Montfort III Duke Brittany 3 x Great Grand Son of King Henry III of England
Great x 4 Grandfather: King Louis IX of France Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Philip "Bold" III King France 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Margaret Provence Queen Consort France
Great x 2 Grandfather: Louis I Count Évreux 3 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Henry Reginar III Duke Brabant 4 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandmother: Maria Reginar Queen Consort France 5 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandmother: Adelaide Burgundy Duchess Brabant 5 x Great Grand Daughter of King William "Conqueror" I of England
Great x 1 Grandfather: Philip "Noble" III King Navarre 2 x Great Grand Son of King Henry III of England
Great x 4 Grandfather: Robert Artois II Count Artois 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Philip Artois 3 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Amice Countenay Countess Artois 4 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 2 Grandmother: Margaret Artois Countess Évreux Great Grand Daughter of King Henry III of England
Great x 4 Grandfather: John Capet II Duke Brittany 5 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandmother: Blanche Capet Grand Daughter 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 3 x Great Grand Son of King Henry III of England
Great x 4 Grandfather: Philip "Bold" III King France 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Philip "The Fair" IV King France 3 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Isabella Barcelona Queen Consort France
Great x 2 Grandfather: Louis X King France I Navarre 4 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Henry I King Navarre 4 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandmother: Joan Blois I Queen Navarre 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Blanche Capet Queen Navarre 2 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 1 Grandmother: Joan Capet II Queen Navarre 4 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Hugh IV Duke Burgundy 4 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandfather: Robert II Duke Burgundy 5 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandmother: Yolande Capet Duchess Burgundy
Great x 2 Grandmother: Margaret of Burgundy Queen Consort France 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: King Louis IX of France Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Agnes Capet Duchess Burgundy 2 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Margaret Provence Queen Consort France
Mother: Joanna of Navarre Queen Consort England 4 x Great Grand Daughter of King Henry III of England
Great x 4 Grandfather: Philip "Bold" III King France 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Charles Valois I Count Valois 3 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Isabella Barcelona Queen Consort France
Great x 2 Grandfather: King Philip "Fortunate" VI of France 4 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Charles II King Naples 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Margaret Capet Countess Valois 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Mary of Hungary Queen Consort Naples
Great x 1 Grandfather: King John "The Good" II of France 4 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Hugh IV Duke Burgundy 4 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandfather: Robert II Duke Burgundy 5 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandmother: Yolande Capet Duchess Burgundy
Great x 2 Grandmother: Joan "Lame" Burgundy Queen Consort France 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: King Louis IX of France Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Agnes Capet Duchess Burgundy 2 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Margaret Provence Queen Consort France
GrandMother: Joan Valois Queen Consort Navarre 5 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Henry Luxemburg VI Count Luxemburg 5 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandfather: Henry Luxemburg VII Holy Roman Emperor 5 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandmother: Beatrice Avesnes Countess Luxemburg 4 x Great Grand Daughter of King William "Conqueror" I of England
Great x 2 Grandfather: King John I of Bohemia 6 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandfather: John I Brabant
Great x 3 Grandmother: Margaret Brabant Countess Luxemburg and Namur
Great x 1 Grandmother: Bonne Luxemburg Queen Consort France 7 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Ottokar "Iron King" II King Bohemia
Great x 3 Grandfather: King Wenceslaus II of Bohemia and Poland
Great x 4 Grandmother: Kunigunda Rostislavna Přemyslovna
Great x 2 Grandmother: Queen Elizabeth of Bohemia
Great x 4 Grandfather: Rudolph I King Romans
Great x 3 Grandmother: Queen Judith of Bohemia and Poland
Great x 4 Grandmother: Gertrude Hohenburg
