Biography of Peter "Cruel" I King Castile 1334-1369
Paternal Family Tree: Ivrea
In 1325 [his father] Alfonso "Avenger" XI King Castile (age 13) and [his step-mother] Constanza Manuel Queen Consort Castile (age 9) were married. She by marriage Queen Consort Castile. The marriage was annulled in 1327; there was no issue from the marriage. He the son of [his grandfather] Ferdinand IV King Castile IV King Leon and [his grandmother] Constance Burgundy Queen Consort Castile Queen Consort Leon. They were second cousins. He a great x 4 grandson of King Henry "Curtmantle" II of England. She a great x 4 granddaughter of King Henry "Curtmantle" II of England.
In 1328 [his father] Alfonso "Avenger" XI King Castile (age 16) and [his mother] Maria Burgundy Queen Consort Castile (age 15) were married. She by marriage Queen Consort Castile. She the daughter of [his grandfather] Alfonso "Brave" IV King Portugal (age 36) and [his grandmother] Beatrice Ivrea Queen Consort Portugal (age 35). He the son of [his grandfather] Ferdinand IV King Castile IV King Leon and [his grandmother] Constance Burgundy Queen Consort Castile Queen Consort Leon. They were double first cousins. He a great x 4 grandson of King Henry "Curtmantle" II of England. She a great x 4 granddaughter of King Henry "Curtmantle" II of England.
On 30 Aug 1334 Peter "Cruel" I King Castile was born to Alfonso "Avenger" XI King Castile (age 23) and Maria Burgundy Queen Consort Castile (age 21). Coefficient of inbreeding 14.45%.
On 26 Mar 1350 [his father] Alfonso "Avenger" XI King Castile (age 38) died of plague. His son Peter "Cruel" I King Castile (age 15) succeeded I King Castile.
In 1353 [his illegitimate daughter] Beatrice Ivrea was born illegitimately to Peter "Cruel" I King Castile (age 18) and Maria Padilla (age 19).
Around Jul 1353 Peter "Cruel" I King Castile (age 18) and Blanche Bourbon Queen Consort Castile (age 14) were married. She by marriage Queen Consort Castile. She the daughter of Peter Bourbon Duke Bourbon (age 42) and Isabella Valois Duchess Bourbon (age 40). He the son of Alfonso "Avenger" XI King Castile and Maria Burgundy Queen Consort Castile (age 40). They were third cousin once removed. He a great x 5 grandson of King Henry "Curtmantle" II of England. She a great x 3 granddaughter of King Henry III of England.
Around Jul 1353 Peter "Cruel" I King Castile (age 18) abandoned abandoned Blanche within three days when he learned that she had an affair with his illegitimate brother [his illegitimate half-brother] Fadrique Alfonso Ivrea (age 19) en route to Spain, and that the dowry was not coming.
In 1354 [his illegitimate daughter] Constance of Castile Duchess of Lancaster was born illegitimately to Peter "Cruel" I King Castile (age 19) and Maria Padilla (age 20).
In 1355 [his illegitimate daughter] Isabella of Castile Duchess York was born illegitimately to Peter "Cruel" I King Castile (age 20) and Maria Padilla (age 21).
On 29 May 1358 [his illegitimate half-brother] Fadrique Alfonso Ivrea (age 24) was murdered at Seville on behalf of his brother Peter "Cruel" I King Castile (age 23).
In 1359 [his illegitimate son] Alfonso Ivrea was born illegitimately to Peter "Cruel" I King Castile (age 24) and Maria Padilla (age 25).
In 1361 [his wife] Blanche Bourbon Queen Consort Castile (age 22) died.
On 03 Apr 1367 the forces of Peter "Cruel" I King Castile (age 32) commanded by Edward "Black Prince" (age 36) defeated the army of [his illegitimate half-brother] Henry "Fratricide" II King Castile (age 33) at the Battle of Nájera at Nájera [Map]. The English forces included [his future son-in-law] John of Gaunt 1st Duke Lancaster (age 27), William Scrope, Peter Courtenay (age 21), John Devereux 1st Baron Devereux (age 30), John Savile of Shelley and Golcar (age 42), Bernard Brocas (age 37) and Thomas Banastre (age 33).
The forces of Henry "Fratricide" II King Castile included Bertrand Geusclin (age 47). The battle achieved little since Bertrand Geusclin escaped.
John Ferrers 4th Baron Ferrers of Chartley (age 36) was killed. His son Robert Ferrers 5th Baron Ferrers of Chartley (age 9) succeeded 5th Baron Ferrers of Chartley. Margaret Despencer Baroness Ferrers of Chartley by marriage Baroness Ferrers of Chartley.
Edward "Black Prince" thereafter returned home, taking Peter's daughters [his illegitimate daughter] Constance (age 13) and [his illegitimate daughter] Isabella (age 12) as hostages to ensure Peter would pay the money owed to Edward. Constance married John of Gaunt 1st Duke Lancaster, Isabella married [his future son-in-law] Edmund of Langley 1st Duke of York (age 25).
On 14 Mar 1369 the army of [his illegitimate half-brother] Henry "Fratricide" II King Castile (age 35) defeated that of his half-brother Peter "Cruel" I King Castile (age 34) at the Battle of Montiel. Henry "Fratricide" II King Castile 1334-1379's army was commanded by Bertrand Geusclin (age 49). Peter "Cruel" I King Castile escaped to the castle of Montiel, La Mancha.
On 23 Mar 1369 Peter "Cruel" I King Castile (age 34) was murdered by his half-brother [his illegitimate half-brother] Henry "Fratricide" II King Castile (age 35) outside the wall of the castle of Montiel, La Mancha. His half brother Henry "Fratricide" II King Castile succeeded II King Castile.
Excerpta Historica Page 152. Issue Of Katherine De Roelt. Wife Of Sir Hugh Swynford, And Afterwards Of John of Gaunt Duke Of Lancaster.
Letters Patent Of King Henry The Fourth Certifying The Legitimacy Of Sir Thomas Swynford; With Notices Of The Swynford Family.
Every one is aware that John of Gaunt, "time-honoured Lancaster," formed an illicit connection with Katherine, the widow of Sir Hugh Swynford, and daughter and coheiress of Sir Payne Roet, Knight, a native of Hainault, and Guienne King of Arms, and that he subsequently married her.
This lady had been governess of the Duke's daughters by his first wife, when his attachment to her, perhaps, commenced. In March 1377, Lady Swynford obtained a confirmation from Edward the Third of a grant from the Duke of Lancaster, of the manors of Gryngelley and Wheteley for life.1 On the 27th December, 3 Ric. II. 1379, the Duke granted her the wardship of the heir of Bertram de Sanneby, "pour le bone et greable service quelle nostre treschier et bien amee Dame Katherine Swynford, Maistresse de noz tresames filles Philipe et Elizabeth de Lancastre, ad fait a nos dittes filles;" and in September, 5 Ric. II. 1381, he gave her an annuity of two hundred marks, payable out of his honor of Tickhill.2 The Duke's second wife [his illegitimate daughter] Constance, daughter and heiress of Peter, King of Castile and Leon, died in 1394; and two years afterwards, namely, on the 13th January 1396, being then about the age of fifty-four, he married Lady Swynford at Lincoln, to the great displeasure of the Duchess of Gloucester and other ladies of the blood royal.3 As Lady Swynford was then upwards of forty, and had been the Duke's mistress above twenty years, it may be inferred, that gratitude and conscientious motives were his only inducements for making her his wife. The Duke of Lancaster had by her, before his marriage, four children, who were surnamed Beaufort, from being born in Beaufort Castle in France: namely, John, who became Earl and Marquess of Somerset; Henry, Bishop of Winchester and Cardinal of England; Thomas, Duke of Exeter;4 and Joan, who married Ralph Neville, Earl of Westmoreland. All these children obtained letters of legitimation from Richard the Second, in February 1397, which was preceded by a similar act by the Pope. The King's patent for the purpose was read in the Parliament then sitting at Westminster;5 and the proceeding was ratified and confirmed by its authority. On the same occasion, Sir John Beaufort was created Earl of Somerset to hold to him and the heirs male of his body.6
Note 1. Fœdera, vii. 140.
Note 2. Sandford's Genealogical History, ed. 1707, p. 253.
Note 3. Ibid. and Dugdale's Baronage, ii. 119.
Note 4. He was buried at Bury St. Edmund's, and on the 20th of February 1772, his corpse being accidentally discovered, the coffin was sold as old lead, and his remains shamefully exposed.
Note 5. Rot. Parl. iii. p. 343a.
Note 6. Rot. Parl. iii. p. 343.
Kings Wessex: Great x 10 Grand Son of King Edmund "Ironside" I of England
Kings England: Great x 5 Grand Son of King Henry "Curtmantle" II of England
Kings Scotland: Great x 9 Grand Son of King Duncan I of Scotland
Kings Franks: Great x 16 Grand Son of Louis "Pious" King Aquitaine I King Franks
Kings France: Great x 9 Grand Son of Robert "Pious" II King France
Catherine of Lancaster Queen Consort Castile
Anne Neville Queen Consort England
Brigadier-General Charles FitzClarence
Great x 4 Grandfather: Alfonso IX King Leon
Great x 3 Grandfather: Ferdinand III King Castile III King Leon Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Berengaria Ivrea I Queen Castile Grand Daughter of King Henry "Curtmantle" II of England
Great x 2 Grandfather: Alfonso X King Castile X King Leon 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Philip King Germany 
Great x 3 Grandmother: Elisabeth Hohenstaufen Queen Consort Castile Queen Consort Leon
Great x 1 Grandfather: Sancho IV King Castile IV King Leon 3 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Peter II King Aragon 
Great x 3 Grandfather: James I King Aragon
Great x 4 Grandmother: Marie Montpellier Queen Consort Aragon
Great x 2 Grandmother: Violante Barcelona Queen Consort Castile Queen Consort Leon
Great x 4 Grandfather: King Andrew II of Hungary
Great x 3 Grandmother: Violant Árpád Queen Consort Aragon
GrandFather: Ferdinand IV King Castile IV King Leon 4 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 1 Grandmother: Maria Molina Queen Consort Castile Queen Consort Leon
Father: Alfonso "Avenger" XI King Castile 4 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Sancho "Populator" I King Portugal 
Great x 3 Grandfather: Alfonso "Fat" II King Portugal
Great x 4 Grandmother: Dulce Barcelona Queen Consort Portugal
Great x 2 Grandfather: Alfonso III King Portugal Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Alfonso VIII King Castile
Great x 3 Grandmother: Urraca Ivrea Queen Consort Portugal Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Eleanor Plantagenet Queen Consort Castile Daughter of King Henry "Curtmantle" II of England
Great x 1 Grandfather: Denis I King Portugal 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Ferdinand III King Castile III King Leon Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Alfonso X King Castile X King Leon 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Elisabeth Hohenstaufen Queen Consort Castile Queen Consort Leon
Great x 2 Grandmother: Beatrice Queen Consort Portugal 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Mayor Guillén de Guzmán
GrandMother: Constance Burgundy Queen Consort Castile Queen Consort Leon 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Peter II King Aragon
Great x 3 Grandfather: James I King Aragon
Great x 4 Grandmother: Marie Montpellier Queen Consort Aragon
Great x 2 Grandfather: Peter III King Aragon
Great x 4 Grandfather: King Andrew II of Hungary
Great x 3 Grandmother: Violant Árpád Queen Consort Aragon
Great x 1 Grandmother: Elisabeth Barcelona Queen Consort Portugal 6 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Frederick I King Jerusalem II Holy Roman Emperor
Great x 3 Grandfather: Manfred King Sicily
Great x 4 Grandmother: Bianca Lancia
Great x 2 Grandmother: Constance Hohenstaufen Queen Consort Aragon 5 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Amedeo Savoy IV Count Savoy
Great x 3 Grandmother: Beatrice Savoy Marchioness of Saluzzo 4 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandmother: Margaret Burgundy Countess Savoy 3 x Great Grand Daughter of King William "Conqueror" I of England
Peter "Cruel" I King Castile 5 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Sancho "Populator" I King Portugal
Great x 3 Grandfather: Alfonso "Fat" II King Portugal
Great x 4 Grandmother: Dulce Barcelona Queen Consort Portugal
Great x 2 Grandfather: Alfonso III King Portugal Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Alfonso VIII King Castile
Great x 3 Grandmother: Urraca Ivrea Queen Consort Portugal Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Eleanor Plantagenet Queen Consort Castile Daughter of King Henry "Curtmantle" II of England
Great x 1 Grandfather: Denis I King Portugal 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Ferdinand III King Castile III King Leon Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Alfonso X King Castile X King Leon 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Elisabeth Hohenstaufen Queen Consort Castile Queen Consort Leon
Great x 2 Grandmother: Beatrice Queen Consort Portugal 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Mayor Guillén de Guzmán
GrandFather: Alfonso "Brave" IV King Portugal 3 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Peter II King Aragon
Great x 3 Grandfather: James I King Aragon
Great x 4 Grandmother: Marie Montpellier Queen Consort Aragon
Great x 2 Grandfather: Peter III King Aragon
Great x 4 Grandfather: King Andrew II of Hungary
Great x 3 Grandmother: Violant Árpád Queen Consort Aragon
Great x 1 Grandmother: Elisabeth Barcelona Queen Consort Portugal 6 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Frederick I King Jerusalem II Holy Roman Emperor
Great x 3 Grandfather: Manfred King Sicily
Great x 4 Grandmother: Bianca Lancia
Great x 2 Grandmother: Constance Hohenstaufen Queen Consort Aragon 5 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Amedeo Savoy IV Count Savoy
Great x 3 Grandmother: Beatrice Savoy Marchioness of Saluzzo 4 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandmother: Margaret Burgundy Countess Savoy 3 x Great Grand Daughter of King William "Conqueror" I of England
Mother: Maria Burgundy Queen Consort Castile 4 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Alfonso IX King Leon
Great x 3 Grandfather: Ferdinand III King Castile III King Leon Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Berengaria Ivrea I Queen Castile Grand Daughter of King Henry "Curtmantle" II of England
Great x 2 Grandfather: Alfonso X King Castile X King Leon 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Philip King Germany
Great x 3 Grandmother: Elisabeth Hohenstaufen Queen Consort Castile Queen Consort Leon
Great x 1 Grandfather: Sancho IV King Castile IV King Leon 3 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Peter II King Aragon
Great x 3 Grandfather: James I King Aragon
Great x 4 Grandmother: Marie Montpellier Queen Consort Aragon
Great x 2 Grandmother: Violante Barcelona Queen Consort Castile Queen Consort Leon
Great x 4 Grandfather: King Andrew II of Hungary
Great x 3 Grandmother: Violant Árpád Queen Consort Aragon
GrandMother: Beatrice Ivrea Queen Consort Portugal 4 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 1 Grandmother: Maria Molina Queen Consort Castile Queen Consort Leon