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Biography of Ferdinand IV King Castile IV King Leon 1285-1312
Paternal Family Tree: Ivrea
In 1282 [his father] Sancho IV King Castile IV King Leon (age 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 (age 60) and [his grandmother] Violante Barcelona Queen Consort Castile Queen Consort Leon. He a great x 3 grandson of King Henry "Curtmantle" II of England.
On 06 Dec 1285 Ferdinand IV King Castile IV King Leon was born to Sancho IV King Castile IV King Leon (age 27) and Maria Molina Queen Consort Castile Queen Consort Leon.
On 25 Apr 1295 [his father] Sancho IV King Castile IV King Leon (age 36) died. His son Ferdinand IV King Castile IV King Leon (age 9) succeeded IV King Castile, IV King Leon.
On 23 Jan 1302 Ferdinand IV King Castile IV King Leon (age 16) and Constance Burgundy Queen Consort Castile Queen Consort Leon (age 12) were married. She by marriage Queen Consort Castile, Queen Consort Leon. She the daughter of Denis I King Portugal (age 40) and Elisabeth Barcelona Queen Consort Portugal (age 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 (age 21) and [his wife] Constance Burgundy Queen Consort Castile Queen Consort Leon (age 16). Coefficient of inbreeding 3.60%.
In 1308 [his daughter] Constance Ivrea was born to Ferdinand IV King Castile IV King Leon (age 22) and [his wife] Constance Burgundy Queen Consort Castile Queen Consort Leon (age 17). Coefficient of inbreeding 3.60%.
On 12 Sep 1309 [his brother-in-law] Alfonso "Brave" IV King Portugal (age 18) and [his sister] Beatrice Ivrea Queen Consort Portugal (age 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 (age 47) and [his mother-in-law] Elisabeth Barcelona Queen Consort Portugal (age 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.
On 13 Aug 1311 [his son] Alfonso "Avenger" XI King Castile was born to Ferdinand IV King Castile IV King Leon (age 25) and [his wife] Constance Burgundy Queen Consort Castile Queen Consort Leon (age 21). Coefficient of inbreeding 3.60%.
On 07 Sep 1312 Ferdinand IV King Castile IV King Leon (age 26) died. His son [his son] Alfonso "Avenger" XI King Castile (age 1) succeeded XI King Castile.
On 18 Nov 1313 [his former wife] Constance Burgundy Queen Consort Castile Queen Consort Leon (age 23) died.
Kings Wessex: Great x 9 Grand Son of King Edmund "Ironside" I of England
Kings England: Great x 4 Grand Son of King Henry "Curtmantle" II of England
Kings Scotland: Great x 8 Grand Son of King Duncan I of Scotland
Kings Franks: Great x 14 Grand Son of Louis "Pious" King Aquitaine I King Franks
Kings France: Great x 8 Grand Son of Robert "Pious" II King France
Kings Duke Aquitaine: Great x 13 Grand Son of Ranulf I Duke Aquitaine
Great x 4 Grandfather: Alfonso VII King Castile VII King Leon
Great x 3 Grandfather: Ferdinand II King Leon
Great x 4 Grandmother: Berenguela Barcelona Queen Consort Castile and Leon
Great x 2 Grandfather: Alfonso IX King Leon
Great x 4 Grandfather: Afonso "Conqueror Founder Great" I King Portugal 
Great x 3 Grandmother: Urraca Burgundy Queen Consort Leon
Great x 4 Grandmother: Malfada Savoy Queen Consort Portugal
Great x 1 Grandfather: Ferdinand III King Castile III King Leon Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Sancho III King Castile
Great x 3 Grandfather: Alfonso VIII King Castile
Great x 4 Grandmother: Blanche Ramirez Queen Consort Castile
Great x 2 Grandmother: Berengaria Ivrea I Queen Castile Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: King Henry "Curtmantle" II of England 
Grand Son 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
GrandFather: Alfonso X King Castile X King Leon 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Frederick "One Eyed" Hohenstaufen I Holy Roman Emperor 
Great x 3 Grandfather: Frederick "Barbarossa" Hohenstaufen I Holy Roman Emperor
Great x 4 Grandmother: Judith Welf Holy Roman Empress
Great x 2 Grandfather: Philip King Germany
Great x 4 Grandfather: Reginald Ivrea III Count Burgundy
Great x 3 Grandmother: Beatrice Ivrea Holy Roman Empress
Great x 1 Grandmother: Elisabeth Hohenstaufen Queen Consort Castile Queen Consort Leon
Father: Sancho IV King Castile IV King Leon 3 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Raymond Berenguer Barcelona V Count Barcelona
Great x 3 Grandfather: Alfonso II King Aragon
Great x 4 Grandmother: Petronilla Jiménez Queen Aragon
Great x 2 Grandfather: Peter II King Aragon
Great x 4 Grandfather: Alfonso VII King Castile VII King Leon
Great x 3 Grandmother: Sancha Ivrea Queen Consort Aragon
Great x 4 Grandmother: Richeza Unknown Queen Consort Castile Queen Consort Leon
Great x 1 Grandfather: James I King Aragon
Great x 2 Grandmother: Marie Montpellier Queen Consort Aragon
GrandMother: Violante Barcelona Queen Consort Castile Queen Consort Leon
Great x 4 Grandfather: King Géza II of Hungary
Great x 3 Grandfather: King Béla III of Hungary
Great x 2 Grandfather: King Andrew II of Hungary
Great x 1 Grandmother: Violant Árpád Queen Consort Aragon
Ferdinand IV King Castile IV King Leon 4 x Great Grand Son of King Henry "Curtmantle" II of England