Paternal Family Tree: Grailly
Maternal Family Tree: Gersenda II Sabran Countess Provence 1180-1242
Jacques Foix Count Montfort was appointed Count Montfort.
In 1436 [his father] Gaston IV Count Foix [aged 13] and [his mother] Eleanor Trastámara Queen Consort Navarre [aged 9] were married. She by marriage Countess Foix. She the daughter of [his grandfather] John II King Aragon [aged 37] and [his grandmother] Blanche Évreux Queen Consort Aragon [aged 48]. He the son of John I Count Foix [aged 54] and Jeanne Albret Countess Foix.
In 1469 Jacques Foix Count Montfort was born to Gaston IV Count Foix [aged 46] and Eleanor Trastámara Queen Consort Navarre [aged 42].
In 1470 [his brother] Gaston V Count Foix [aged 27] was killed in a tournament.
On 28th July 1472 [his father] Gaston IV Count Foix [aged 49] died.
On 8th September 1476 [his brother] Jean Foix Count Étampes [aged 30] and [his sister-in-law] Marie Valois Viscountess Narbonne [aged 18] were married. She the daughter of Charles Valois Duke Orléans and Mary de la Marck Duchess Orléans. He the son of [his father] Gaston IV Count Foix and [his mother] Eleanor Trastámara Queen Consort Navarre [aged 50]. They were third cousin once removed.
In 1478 [his brother] Jean Foix Count Étampes [aged 32] was appointed Count Étampes.
On 28th January 1479 [his mother] Eleanor Trastámara Queen Consort Navarre [aged 52] was crowned Queen Consort Navarre.
On 12th February 1479 [his mother] Eleanor Trastámara Queen Consort Navarre [aged 53] died.
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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In 1485 Jacques Foix Count Montfort [aged 16] and Ana Peralta were married. She the daughter of Pedro Peralta Count Santisteban y Lerín. He the son of Gaston IV Count Foix and Eleanor Trastámara Queen Consort Navarre.
In 1494 Jacques Foix Count Montfort [aged 25] and Ana Peralta were divorced.
In 1495 Jacques Foix Count Montfort [aged 26] and Catherine Beaumont were married. He the son of Gaston IV Count Foix and Eleanor Trastámara Queen Consort Navarre.
In 1500 [his brother] Jean Foix Count Étampes [aged 54] died.
In 1500 Jacques Foix Count Montfort [aged 31] died.
Kings Wessex: Great x 13 Grand Son of King Edmund "Ironside" I of England
Kings Godwinson: Great x 13 Grand Son of King Harold II of England
Kings England: Great x 7 Grand Son of King Henry III of England
Kings Scotland: Great x 11 Grand Son of King Malcolm III of Scotland
Kings France: Great x 3 Grand Son of King John "The Good" II of France
Kings Duke Aquitaine: Great x 17 Grand Son of Ranulf I Duke Aquitaine
Kings Spain: Grand Son of John II King Aragon
Great x 3 Grandfather: Peter Grailly
Great x 2 Grandfather: Peter Grailly
Great x 1 Grandfather: Archambaud Grailly Count Foix
Grandfather: John I Count Foix
Great x 1 Grandmother: Isabelle Countess Foix
father: Gaston IV Count Foix
Great x 1 Grandfather: Charles Albret
Grandmother: Jeanne Albret Countess Foix
Great x 1 Grandmother: Marie d Louis and Isabel Craon Sully
Jacques Foix Count Montfort Grandson of John II King Aragon
Great x 4 Grandfather: Alfonso "Avenger" XI King Castile 
4 x Great Grandson of Alfonso II King Aragon
Great x 3 Grandfather: Henry "Fratricide" II King Castile 5 x Great Grandson of Alfonso II King Aragon
Great x 4 Grandmother: Eleanor Guzman
Great x 2 Grandfather: John I King Castile 3 x Great Grandson of King Louis IX of France
Great x 4 Grandfather: Juan Manuel Prince of Villena 3 x Great Grandson of Alfonso VII King Castile VII King Leon
Great x 3 Grandmother: Juana Manuel Queen of Castile 2 x Great Granddaughter of King Louis IX of France
Great x 4 Grandmother: Blanca de la Cerda y Lara Great Granddaughter of King Louis IX of France
Great x 1 Grandfather: Ferdinand I King Aragon 4 x Great Grandson of King Louis IX of France
Great x 4 Grandfather: Alfonso IV King Aragon 
2 x Great Grandson of King Louis VIII of France
Great x 3 Grandfather: Peter IV King Aragon 3 x Great Grandson of King Louis VIII of France
Great x 4 Grandmother: Teresa Enteca Queen Consort Aragon
Great x 2 Grandmother: Eleanor Barcelona Queen Consort Castile 4 x Great Granddaughter of King Louis VIII of France
Great x 4 Grandfather: Peter II King Sicily 2 x Great Grandson of King Louis VIII of France
Great x 3 Grandmother: Eleanor of Sicily Queen Consort Aragon 3 x Great Granddaughter of King Louis VIII of France
Grandfather: John II King Aragon -2 x Great Grandson of John II King Aragon
Great x 4 Grandfather: Ferdinand IV King Castile IV King Leon 3 x Great Grandson of Alfonso II King Aragon
Great x 3 Grandfather: Alfonso "Avenger" XI King Castile 4 x Great Grandson of Alfonso II King Aragon
Great x 4 Grandmother: Constance Burgundy Queen Consort Castile Queen Consort Leon 
3 x Great Granddaughter of King Henry "Curtmantle" II of England
Great x 2 Grandfather: Sancho Alfonso Ivrea 5 x Great Grandson of Alfonso II King Aragon
Great x 3 Grandmother: Eleanor Guzman
Great x 1 Grandmother: Eleanor of Alberquerque Queen Consort Aragon 6 x Great Granddaughter of Alfonso II King Aragon
Great x 4 Grandfather: Alfonso "Brave" IV King Portugal 3 x Great Grandson of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Peter I King Portugal 4 x Great Grandson of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Beatrice Ivrea Queen Consort Portugal 3 x Great Granddaughter of Alfonso II King Aragon
Great x 2 Grandmother: Beatrice Burgundy 5 x Great Granddaughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Pedro Fernández de Castro
Great x 3 Grandmother: Inês Castro
mother: Eleanor Trastámara Queen Consort Navarre daughter of John II King Aragon
Great x 4 Grandfather: Louis I Count Évreux 
son of King Philip III of France
Great x 3 Grandfather: Philip "Noble" III King Navarre Grandson of King Philip III of France
Great x 4 Grandmother: Margaret Artois Countess Évreux Great Granddaughter of King Henry III of England
Great x 2 Grandfather: Charles "Bad" II King Navarre Grandson of Louis X King France I Navarre
Great x 4 Grandfather: Louis X King France I Navarre son of King Philip IV of France
Great x 3 Grandmother: Joan Capet II Queen Navarre daughter of Louis X King France I Navarre
Great x 4 Grandmother: Margaret of Burgundy Queen Consort France Granddaughter of King Louis IX of France
Great x 1 Grandfather: Charles III King Navarre Grandson of King John "The Good" II of France
Great x 4 Grandfather: King Philip "Fortunate" VI of France Grandson of King Philip III of France
Great x 3 Grandfather: King John "The Good" II of France son of King Philip "Fortunate" VI of France
Great x 4 Grandmother: Joan "Lame" Burgundy Queen Consort France Granddaughter of King Louis IX of France
Great x 2 Grandmother: Joan Valois Queen Consort Navarre daughter of King John "The Good" II of France
Great x 4 Grandfather: King John I of Bohemia 
6 x Great Grandson of King William "Conqueror" I of England
Great x 3 Grandmother: Bonne Luxembourg Queen Consort France 7 x Great Granddaughter of King William "Conqueror" I of England
Great x 4 Grandmother: Queen Elizabeth of Bohemia 7 x Great Granddaughter of King Harold II of England
Grandmother: Blanche Évreux Queen Consort Aragon Great Granddaughter of King John "The Good" II of France
Great x 4 Grandfather: Ferdinand IV King Castile IV King Leon 3 x Great Grandson of Alfonso II King Aragon
Great x 3 Grandfather: Alfonso "Avenger" XI King Castile 4 x Great Grandson of Alfonso II King Aragon
Great x 4 Grandmother: Constance Burgundy Queen Consort Castile Queen Consort Leon 3 x Great Granddaughter of King Henry "Curtmantle" II of England
Great x 2 Grandfather: Henry "Fratricide" II King Castile 5 x Great Grandson of Alfonso II King Aragon
Great x 3 Grandmother: Eleanor Guzman
Great x 1 Grandmother: Eleanor of Castile Queen Consort Navarre 3 x Great Granddaughter of King Louis IX of France
Great x 4 Grandfather: Manuel Ivrea 2 x Great Grandson of Alfonso VII King Castile VII King Leon
Great x 3 Grandfather: Juan Manuel Prince of Villena 3 x Great Grandson of Alfonso VII King Castile VII King Leon
Great x 4 Grandmother: Beatrice Savoy 14 x Great Granddaughter of Charles "Charlemagne aka Great" King of the Franks King Lombardy Holy Roman Emperor
Great x 2 Grandmother: Juana Manuel Queen of Castile 2 x Great Granddaughter of King Louis IX of France
Great x 4 Grandfather: Ferdinando de la Cerda Grandson of King Louis IX of France
Great x 3 Grandmother: Blanca de la Cerda y Lara Great Granddaughter of King Louis IX of France
Great x 4 Grandmother: Juana "La Palomilla" Núñez de Lara 3 x Great Granddaughter of Alfonso II King Aragon