Paternal Family Tree: Ivrea
In 1282 [his father] Sancho IV King Castile IV King Leon [aged 23] and [his mother] Maria Molina Queen Consort Castile Queen Consort Leon were married. He the son of [his grandfather] Alfonso X King Castile X King Leon [aged 60] and [his grandmother] Violante Barcelona Queen Consort Castile Queen Consort Leon.
On 6th December 1285 Ferdinand IV King Castile IV King Leon was born to Sancho IV King Castile IV King Leon [aged 27] and Maria Molina Queen Consort Castile Queen Consort Leon. He a great x 4 grandson of King Henry "Curtmantle" II of England.
On 1st December 1291 [his brother-in-law] James "The Just" II King Aragon [aged 24] and [his sister] Isabella of Castile Queen Consort Aragon [aged 8] were married. She by marriage Queen Consort Aragon. She the daughter of [his father] Sancho IV King Castile IV King Leon [aged 33] and [his mother] Maria Molina Queen Consort Castile Queen Consort Leon. He the son of Peter III King Aragon and Constance Hohenstaufen Queen Consort Aragon [aged 42]. They were first cousin once removed. She a great x 4 granddaughter of King Henry "Curtmantle" II of England.
On 25th April 1295 [his father] Sancho IV King Castile IV King Leon [aged 36] died. His son Ferdinand [aged 9] succeeded IV King Castile, IV King Leon.
On 23rd January 1302 Ferdinand IV King Castile IV King Leon [aged 16] and Constance Burgundy Queen Consort Castile Queen Consort Leon [aged 12] were married. She by marriage Queen Consort Castile, Queen Consort Leon. She the daughter of Denis I King Portugal [aged 40] and Elisabeth Barcelona Queen Consort Portugal [aged 31]. He the son of Sancho IV King Castile IV King Leon and Maria Molina Queen Consort Castile Queen Consort Leon. They were half first cousin once removed. He a great x 4 grandson of King Henry "Curtmantle" II of England. She a great x 3 granddaughter of King Henry "Curtmantle" II of England.
In 1307 [his daughter] Eleanor Ivrea Queen Consort Aragon was born to Ferdinand IV King Castile IV King Leon [aged 21] and [his wife] Constance Burgundy Queen Consort Castile Queen Consort Leon [aged 16]. She a great x 4 granddaughter of King Henry "Curtmantle" II of England. Coefficient of inbreeding 3.60%. She married her first cousin once removed Alfonso IV King Aragon, son of James "The Just" II King Aragon and Blanche Capet Queen Consort Aragon, and had issue.
In 1308 [his daughter] Constance Ivrea was born to Ferdinand IV King Castile IV King Leon [aged 22] and [his wife] Constance Burgundy Queen Consort Castile Queen Consort Leon [aged 17]. She a great x 4 granddaughter of King Henry "Curtmantle" II of England. Coefficient of inbreeding 3.60%. She died aged two in 1310.
On 12th September 1309 [his brother-in-law] Alfonso "Brave" IV King Portugal [aged 18] and [his sister] Beatrice Ivrea Queen Consort Portugal [aged 16] were married. She the daughter of [his father] Sancho IV King Castile IV King Leon and [his mother] Maria Molina Queen Consort Castile Queen Consort Leon. He the son of [his father-in-law] Denis I King Portugal [aged 47] and [his mother-in-law] Elisabeth Barcelona Queen Consort Portugal [aged 38]. They were half first cousin once removed. He a great x 3 grandson of King Henry "Curtmantle" II of England. She a great x 4 granddaughter of King Henry "Curtmantle" II of England.
In 1310 [his brother-in-law] John III Duke Brittany [aged 23] and [his sister] Isabella of Castile Queen Consort Aragon [aged 27] were married. She by marriage Duchess Brittany 1221 Dreux. She the daughter of [his father] Sancho IV King Castile IV King Leon and [his mother] Maria Molina Queen Consort Castile Queen Consort Leon. They were fourth cousin once removed. He a great grandson of King Henry III of England. She a great x 4 granddaughter of King Henry "Curtmantle" II of England.
In 1310 [his daughter] Constance Ivrea [aged 2] died.
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On 13th August 1311 [his son] Alfonso "Avenger" XI King Castile was born to Ferdinand IV King Castile IV King Leon [aged 25] and [his wife] Constance Burgundy Queen Consort Castile Queen Consort Leon [aged 21]. He a great x 4 grandson of King Henry "Curtmantle" II of England. Coefficient of inbreeding 3.60%. He married (1) 1325 his second cousin Constanza Manuel Queen Consort Castile, daughter of Juan Manuel Prince of Villena and Constance Barcelona (2) 1328 his double first cousin Maria Burgundy Queen Consort Castile, daughter of Alfonso "Brave" IV King Portugal and Beatrice Ivrea Queen Consort Portugal, and had issue.
On 7th September 1312 Ferdinand IV King Castile IV King Leon [aged 26] died. His son Alfonso [aged 1] succeeded XI King Castile.
On 18th November 1313 [his former wife] Constance Burgundy Queen Consort Castile Queen Consort Leon [aged 23] died.
Kings Wessex: Great x 9 Grand Son of King Edmund "Ironside" I of England
Kings Godwinson: Great x 7 Grand Son of King Harold II of England
Kings England: Great x 4 Grand Son of King Henry "Curtmantle" II of England
Kings Scotland: Great x 7 Grand Son of King Malcolm III of Scotland
Kings France: Great x 9 Grand Son of Hugh I King of the Franks
Kings Duke Aquitaine: Great x 13 Grand Son of Ranulf I Duke Aquitaine
Kings Spain: Great x 3 Grand Son of Alfonso II King Aragon
Great x 4 Grandfather: Alfonso VII King Castile VII King Leon 
-2 x Great Grandson of Alfonso VII King Castile VII King Leon
Great x 3 Grandfather: Ferdinand II King Leon son of Alfonso VII King Castile VII King Leon
Great x 4 Grandmother: Berenguela Barcelona Queen Consort Castile and Leon 11 x Great Granddaughter of Charles "Charlemagne aka Great" King of the Franks King Lombardy Holy Roman Emperor
Great x 2 Grandfather: Alfonso IX King Leon Grandson of Alfonso VII King Castile VII King Leon
Great x 4 Grandfather: Afonso "Conqueror Founder Great" I King Portugal 
3 x Great Grandson of Hugh I King of the Franks
Great x 3 Grandmother: Urraca Burgundy Queen Consort Leon 4 x Great Granddaughter of Hugh I King of the Franks
Great x 4 Grandmother: Malfada Savoy Queen Consort Portugal 11 x Great Granddaughter of Charles "Charlemagne aka Great" King of the Franks King Lombardy Holy Roman Emperor
Great x 1 Grandfather: Ferdinand III King Castile III King Leon Great Grandson of Alfonso VII King Castile VII King Leon
Great x 4 Grandfather: Sancho III King Castile son of Alfonso VII King Castile VII King Leon
Great x 3 Grandfather: Alfonso VIII King Castile Grandson of Alfonso VII King Castile VII King Leon
Great x 4 Grandmother: Blanche Ramirez Queen Consort Castile
Great x 2 Grandmother: Berengaria Ivrea I Queen Castile Granddaughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: King Henry "Curtmantle" II of England 
Grandson of King Henry I "Beauclerc" England
Great x 3 Grandmother: Eleanor Plantagenet Queen Consort Castile daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Eleanor of Aquitaine Queen Consort Franks and England 4 x Great Granddaughter of Hugh I King of the Franks
Grandfather: Alfonso X King Castile X King Leon 2 x Great Grandson of Alfonso VII King Castile VII King Leon
Great x 4 Grandfather: Frederick "One Eyed" Hohenstaufen I Holy Roman Emperor 
Great x 3 Grandfather: Frederick "Barbarossa" Hohenstaufen I Holy Roman Emperor 7 x Great Grandson of King Alfred "The Great" of Wessex
Great x 4 Grandmother: Judith Welf Holy Roman Empress 6 x Great Granddaughter of King Alfred "The Great" of Wessex
Great x 2 Grandfather: Philip King Germany 8 x Great Grandson of King Alfred "The Great" of Wessex
Great x 4 Grandfather: Reginald Ivrea III Count Burgundy 6 x Great Grandson of King Edward "Elder" of the Anglo Saxons
Great x 3 Grandmother: Beatrice of Burgundy Holy Roman Empress 7 x Great Granddaughter of King Edward "Elder" of the Anglo Saxons
Great x 1 Grandmother: Elisabeth Hohenstaufen Queen Consort Castile Queen Consort Leon 9 x Great Granddaughter of King Alfred "The Great" of Wessex
father: Sancho IV King Castile IV King Leon 2 x Great Grandson of Alfonso II King Aragon
Great x 4 Grandfather: Raymond V Count Barcelona 
11 x Great Grandson of Charles "Charlemagne aka Great" King of the Franks King Lombardy Holy Roman Emperor
Great x 3 Grandfather: Alfonso II King Aragon -2 x Great Grandson of Alfonso II King Aragon
Great x 4 Grandmother: Petronilla Jiménez Queen Aragon 4 x Great Granddaughter of Hugh I King of the Franks
Great x 2 Grandfather: Peter II King Aragon son of Alfonso II King Aragon
Great x 4 Grandfather: Alfonso VII King Castile VII King Leon -2 x Great Grandson of Alfonso VII King Castile VII King Leon
Great x 3 Grandmother: Sancha Ivrea Queen Consort Aragon daughter of Alfonso VII King Castile VII King Leon
Great x 4 Grandmother: Richeza Unknown Queen Consort Castile Queen Consort Leon
Great x 1 Grandfather: James I King Aragon Grandson of Alfonso II King Aragon
Great x 2 Grandmother: Marie Montpellier Queen Consort Aragon
Grandmother: Violante Barcelona Queen Consort Castile Queen Consort Leon Great Granddaughter of Alfonso II King Aragon
Great x 4 Grandfather: King Géza II of Hungary
Great x 3 Grandfather: King Béla III of Hungary 2 x Great Grandson of King Harold II of England
Great x 4 Grandmother: Euphrosyne of Kiev Great Granddaughter of King Harold II of England
Great x 2 Grandfather: King Andrew II of Hungary 3 x Great Grandson of King Harold II of England
Great x 4 Grandfather: Raynald of Châtillon
Great x 3 Grandmother: Agnes of Antioch 5 x Great Granddaughter of Hugh I King of the Franks
Great x 4 Grandmother: Princess Constance of Antioch 4 x Great Granddaughter of Hugh I King of the Franks
Great x 1 Grandmother: Violant Árpád Queen Consort Aragon 4 x Great Granddaughter of King Harold II of England
Ferdinand IV King Castile IV King Leon 3 x Great Grandson of Alfonso II King Aragon