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Biography of Isabella Aviz Queen Consort Castile 1428-1496

Paternal Family Tree: Capet

Maternal Family Tree: Leonor de Alvim

In 1418 [her future husband] John II King Castile (age 12) and Maria Trastámara Queen Consort Castile (age 22) were married. She by marriage Queen Consort Castile. She the daughter of Ferdinand I King Aragon and Eleanor of Alberquerque Queen Consort Aragon (age 44). He the son of Henry III King Castile and Catherine of Lancaster Queen Consort Castile (age 44). They were first cousins. He a great grandson of King Edward III of England.

In 1424 [her father] Prince John Aviz Constable Portugal (age 23) and [her mother] Isabella of Braganza (age 21) were married. He the son of [her grandfather] King John I of Portugal (age 72) and [her grandmother] Philippa of Lancaster Queen Consort Portugal. They were uncle and niece. He a great grandson of King Edward III of England.

In 1428 Isabella Aviz was born to [her father] Prince John Aviz Constable Portugal (age 27) and [her mother] Isabella of Braganza (age 25). She a great x 2 granddaughter of King Edward III of England. Coefficient of inbreeding 6.37%.

On 18th October 1442 [her father] Prince John Aviz Constable Portugal (age 42) died.

After 1445 John II King Castile (age 39) and Isabella Aviz (age 17) were married. She by marriage Queen Consort Castile. The difference in their ages was 22 years. He the son of Henry III King Castile and Catherine of Lancaster Queen Consort Castile. They were half first cousin once removed. He a great grandson of King Edward III of England. She a great x 2 granddaughter of King Edward III of England.

On 22nd April 1451 [her daughter] Isabella Queen Castile was born to [her husband] John II King Castile (age 46) and Isabella Aviz (age 23). She a great x 2 granddaughter of King Edward III of England. Coefficient of inbreeding 2.60%. She married 19th October 1469 her second cousin Ferdinand II King Aragon, son of John II King Aragon and Juana Enríquez Queen Consort Aragon, and had issue.

On 17th November 1453 [her son] Alfonso Trastámara was born to [her husband] John II King Castile (age 48) and Isabella Aviz (age 25). He a great x 2 grandson of King Edward III of England. Coefficient of inbreeding 2.60%.

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 20th July 1454 [her husband] John II King Castile (age 49) died. His son [her step-son] Henry (age 29) succeeded IV King Castile. Blanche Trastámara II Queen Navarre (age 30) by marriage Queen Consort Castile.

On 26th October 1466 [her mother] Isabella of Braganza (age 64) died.

On 5th July 1468 [her son] Alfonso Trastámara (age 14) died.

On 19th October 1469 [her son-in-law] Ferdinand II King Aragon (age 17) and [her daughter] Isabella Queen Castile (age 18) were married. She by marriage Queen Consort Aragon. She the daughter of [her former husband] John II King Castile and Isabella Aviz (age 41). He the son of John II King Aragon (age 71) and Juana Enríquez Queen Consort Aragon. They were second cousins. She a great x 2 granddaughter of King Edward III of England.

On 15th August 1496 Isabella Aviz (age 68) died.

Isabella Aviz Queen Consort Castile 1428-1496 appears on the following Descendants Family Trees:

Royal Ancestors of Isabella Aviz Queen Consort Castile 1428-1496

Kings Wessex: Great x 12 Grand Daughter of King Edmund "Ironside" I of England

Kings Gwynedd: Great x 16 Grand Daughter of Maredudd ab Owain King Deheubarth King Powys King Gwynedd

Kings Seisyllwg: Great x 18 Grand Daughter of Hywel "Dda aka Good" King Seisyllwg King Deheubarth

Kings Powys: Great x 16 Grand Daughter of Maredudd ab Owain King Deheubarth King Powys King Gwynedd

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

Kings England: Great x 2 Grand Daughter of King Edward III of England

Kings Scotland: Great x 11 Grand Daughter of King Duncan I of Scotland

Kings Franks: Great x 8 Grand Daughter of Louis VII King of the Franks

Kings France: Great x 11 Grand Daughter of Robert "Pious" II King of the Franks

Kings Duke Aquitaine: Great x 16 Grand Daughter of Ranulf I Duke Aquitaine

Royal Descendants of Isabella Aviz Queen Consort Castile 1428-1496
Number after indicates the number of unique routes of descent. Descendants of Kings and Queens not included.

Isabella Queen Castile [1]

Ancestors of Isabella Aviz Queen Consort Castile 1428-1496

Great x 4 Grandfather: Alfonso III King Portugal Great Grand Son of King Henry "Curtmantle" II of England

Great x 3 Grandfather: Denis I King Portugal 2 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 4 Grandmother: Beatrice Queen Consort Portugal 3 x Great Grand Daughter of King Henry "Curtmantle" II of England

Great x 2 Grandfather: Alfonso "Brave" IV King Portugal 3 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 4 Grandfather: Peter III King Aragon

Great x 3 Grandmother: Elisabeth Barcelona Queen Consort Portugal 6 x Great Grand Daughter of King William "Conqueror" I of England

Great x 4 Grandmother: Constance Hohenstaufen Queen Consort Aragon 5 x Great Grand Daughter of King William "Conqueror" I of England

Great x 1 Grandfather: Peter I King Portugal 4 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 4 Grandfather: Alfonso X King Castile X King Leon 2 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 3 Grandfather: Sancho IV King Castile IV King Leon 3 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 2 Grandmother: Beatrice Ivrea Queen Consort Portugal 4 x Great Grand Daughter of King Henry "Curtmantle" II of England

GrandFather: King John I of Portugal 5 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 2 Grandfather: Pedro Fernández de Castro

Great x 1 Grandmother: Inês Castro

Father: Prince John Aviz Constable Portugal Great Grand Son of King Edward III of England

Great x 4 Grandfather: King Edward I of England Son of King Henry III of England

Great x 3 Grandfather: King Edward II of England Son of King Edward I of England

Great x 4 Grandmother: Eleanor of Castile Queen Consort England 2 x Great Grand Daughter of King Henry "Curtmantle" II of England

Great x 2 Grandfather: King Edward III of England Son of King Edward II of England

Great x 4 Grandfather: King Philip IV of France 3 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 3 Grandmother: Isabella of France Queen Consort England 4 x Great Grand Daughter of King Henry "Curtmantle" II of England

Great x 4 Grandmother: Joan Blois I Queen Navarre 3 x Great Grand Daughter of King Henry "Curtmantle" II of England

Great x 1 Grandfather: John of Gaunt 1st Duke Lancaster Son of King Edward III of England

Great x 4 Grandfather: John of Avesnes II Count Hainaut II Count Holland 3 x Great Grand Son of King Stephen I England

Great x 3 Grandfather: William of Avesnes I Count Hainaut III Count Avesnes III Count Holland II Count Zeeland 4 x Great Grand Son of King Stephen I England

Great x 4 Grandmother: Philippa Luxemburg Countess Hainaut and Holland 5 x Great Grand Daughter of King William "Conqueror" I of England

Great x 2 Grandmother: Philippa of Hainaut Queen Consort England 5 x Great Grand Daughter of King Stephen I England

Great x 4 Grandfather: Charles Valois I Count Valois 3 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 3 Grandmother: Joan Valois Countess Zeeland Holland Avesnes and Hainaut 4 x Great Grand Daughter of King Henry "Curtmantle" II of England

Great x 4 Grandmother: Margaret Capet Countess Valois 3 x Great Grand Daughter of King Henry "Curtmantle" II of England

GrandMother: Philippa of Lancaster Queen Consort Portugal Grand Daughter of King Edward III of England

Great x 4 Grandfather: Edmund "Crouchback" Plantagenet 1st Earl of Leicester 1st Earl Lancaster Son of King Henry III of England

Great x 3 Grandfather: Henry Plantagenet 3rd Earl of Leicester 3rd Earl Lancaster Grand Son of King Henry III of England

Great x 4 Grandmother: Blanche Capet Queen Navarre 2 x Great Grand Daughter of King Henry "Curtmantle" II of England

Great x 2 Grandfather: Henry of Grosmont 1st Duke Lancaster Great Grand Son of King Henry III of England

Great x 4 Grandfather: Patrick Chaworth

Great x 3 Grandmother: Maud Chaworth

Great x 4 Grandmother: Isabella Beauchamp

Great x 1 Grandmother: Blanche Duchess of Lancaster 2 x Great Grand Daughter of King Henry III of England

Great x 4 Grandfather: Louis Brienne Viscount Beaumont 2 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 3 Grandfather: Henry Beaumont Earl Buchan 3 x Great Grand Son of King Henry I "Beauclerc" England

Great x 4 Grandmother: Agnes Beaumont Sarthe 2 x Great Grand Daughter of King Henry I "Beauclerc" England

Great x 2 Grandmother: Isabel Beaumont Duchess Lancaster 4 x Great Grand Daughter of King Henry I "Beauclerc" England

Great x 4 Grandfather: Alexander Comyn 6 x Great Grand Son of King Henry I "Beauclerc" England

Great x 3 Grandmother: Alice Comyn Baroness Beaumont 7 x Great Grand Daughter of King Henry I "Beauclerc" England

Great x 4 Grandmother: Joanna Latimer

Isabella Aviz Queen Consort Castile 2 x Great Grand Daughter of King Edward III of England

Great x 4 Grandfather: Denis I King Portugal 2 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 3 Grandfather: Alfonso "Brave" IV King Portugal 3 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 4 Grandmother: Elisabeth Barcelona Queen Consort Portugal 6 x Great Grand Daughter of King William "Conqueror" I of England

Great x 2 Grandfather: Peter I King Portugal 4 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 4 Grandfather: Sancho IV King Castile IV King Leon 3 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 3 Grandmother: Beatrice Ivrea Queen Consort Portugal 4 x Great Grand Daughter of King Henry "Curtmantle" II of England

Great x 1 Grandfather: King John I of Portugal 5 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 3 Grandfather: Pedro Fernández de Castro

Great x 2 Grandmother: Inês Castro

GrandFather: Afonso Aviz I Duke Braganza 6 x Great Grand Son of King Henry "Curtmantle" II of England

Great x 1 Grandmother: Ines Peres

Mother: Isabella of Braganza 7 x Great Grand Daughter of King Henry "Curtmantle" II of England

Great x 1 Grandfather: Nuno Álvares Pereira

GrandMother: Beatriz Pereira de Alvim

Great x 1 Grandmother: Leonor de Alvim