Individual Details

Joan

( - )

Illegitimate daughter of Agatha and King John.

Dugdale, William, The Baronage of England 1675, p. 259

This Robert took to Wife Sibilla the Daughter of William de Braose (of
Brecknock) and for the health of her Soul, as also of the Soul of Berta
her Mother (Daughter to Milo Earl of Hereford) gave to the Monks of
Dore in Herefordshire, all Oxmeode. He also founded a Priory at Wodham (commonly called WodhamFerrers) in Essex.

By this Sibilla he left issue William his Son and Heir; and two Daughters; viz. Milisent the Wife of Roger Lord Mortimer of Wigmore; and Agatha, who, being a Concubine to King John, had by him a Daughter called Joan, married to Leweline Prince of Wales.
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From Castles of Wales
http://www.castlewales.com/clare.html

Gilbert de Clare
The end of the Baronial revolt of the 1260s left Llywelyn ap Gruffydd as the only potential enemy of King Henry III. Prudently, Llywelyn decided to make peace, and by the Treaty of Montgomery (1267) he was recognized as "prince of Wales," and as the feudal lord of the other Welsh princes.
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From thePeerage.com

Llywelyn ap Gruffydd, Prince of North Wales1
M, #102603, b. circa 1223, d. 11 December 1282
Last Edited=25 Oct 2009
Llywelyn ap Gruffydd, Prince of North Wales was born circa 1223.2 He was the son of Gruffydd ap Llywelyn and Senena ferch Rhodri.2 He married Lady Eleanor de Montfort, daughter of Simon de Montfort, 6th Earl of Leicester and Eleanor of England, in 1278. He died on 11 December 1282.2
He succeeded to the title of Prince of Wales in 1246.2
Child of Llywelyn ap Gruffydd, Prince of North Wales and Lady Eleanor de Montfort

Gwenllian ap Llywelyn b. 1282, d. 1337

Citations

[S11] Alison Weir, Britain's Royal Families: The Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 71. Hereinafter cited as Britain's Royal Families.
[S130] Wikipedia, online http;//www.wikipedia.org. Hereinafter cited as Wikipedia.

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thePeerage.com [See below where Agatha is listed as the mother of one of King John's children]

John I 'Lackland', King of England1
M, #102006, b. 24 December 1167, d. 19 October 1216
Last Edited=21 Jan 2011
Consanguinity Index=0.46%
King John I of England
by Renold Elstrick 2
John I 'Lackland', King of England was born on 24 December 1167 at Beaumont Palace, Oxford, Oxfordshire, England.1 He was the son of Henry II 'Curtmantle' d'Anjou, King of England and Eleanor, Duchesse d'Aquitaine. He married, firstly, Isabella de Clare, Countess of Gloucester, daughter of William fitz Robert, 2nd Earl of Gloucester and Hawise de Beaumont, on 29 August 1189 at Marlborough Castle, Marlborough, Wiltshire, England.1 He and Isabella de Clare, Countess of Gloucester were divorced in 1199, on the grounds of consanguinity.1 He married, firstly, Isabella d'Angoulême, daughter of Aymer Taillefer, Comte d'Angoulême and Alice de Courtenay, on 24 August 1200 at Bordeaux Cathedral, Bordeaux, Dauphine, France.3 He died on 19 October 1216 at age 48 at Newark Castle, Newark, Nottinghamshire, England.4 He was buried at Worcester Cathedral, Worcester, Worcestershire, England.4
He and Adela de Warenne were associated.5 He gained the title of King John I of Ireland in 1177.1 He gained the title of Count of Mortain in 1189.1 As a result of his marriage, John I 'Lackland', King of England was styled as Earl of Gloucester on 29 August 1189.1 He succeeded to the title of King John I of England on 6 April 1199.1 He was crowned King of England on 27 May 1199 at Westminster Abbey, Westminster, London, England, and styled 'Rex Anglaie, Dominus Hiberniae, Dux Normanniae, et Dux Aquitaniae.6'
He was a skilled politician and forceful administrator, but one of England's most unpopular monarchs due to his cruelty and deceit. While Richard I was imprisoned abroad, in 1193 John vainly attempted to usurp the throne. He was banished, but soon reconciled and made his brother's heir. On Richard's death, John became king and imprisoned his young nephew Arthur of Brittany, a better claimant who soon died in prison. He married Isabella of Gloucester and then divorced her after his accession to the throne and married Isabella of Angouleme. John imposed crippling taxes and tightened the already severe forest laws, all to raise revenue for his war against the French. This war cost him Normandy and led to high inflation resulting in widespread poverty. He antagonised the Church bringing on an interdict from the Pope, and John himself was excommunicated. The whole population, high and low alike, were in a state of near rebellion. The barons drew up a document which they were intent upon John signing. This document was not a formal constitution but a practical statement that the King must respect institutional customs and law. On Monday 15 June 1215 King John reluctantly signed and sealed the document on the island of Runnymeade in the Thames. This was one of the most memorable events in English history, the document being known as the Magna Carta. Afterwards, John reverted to his bad old ways and Louis, son of the French King, was invited to replace him. Louis entered London unopposed in May 1216 and civil war began to flame. Fortunately for England, John died of dysentry on Wednesday 19 October 1216 at Newark after losing the crown jewels in the Wash. He has an extensive biographical entry in the Dictionary of National Biography.7

Children of John I 'Lackland', King of England and Hawise de Tracy

Oliver (?)8 d. 1290
Osbert Gifford8 d. 1216
Geoffrey FitzRoy8 d. 1205
John FitzJohn8
Odo FitzRoy8 d. c 1242
Ivo (?)8
Henry (?)8
Richard of Wallingford8
Matilda of Barking8
Isabella la Blanche8

Child of John I 'Lackland', King of England and Agatha de Ferrers

Joan (?)9

Child of John I 'Lackland', King of England and Clementina (?)

Joan (?)+8 b. b 1195, d. 1237

Children of John I 'Lackland', King of England and Isabella d'Angoulême

Henry III, King of England+ b. 1 Oct 1207, d. 16 Nov 1272
Richard, 1st Earl of Cornwall+10 b. 5 Jan 1209, d. 2 Apr 1272
Joan of England b. 22 Jul 1210, d. 4 Mar 1238
Isabella of England+ b. 1214, d. 1 Dec 1241
Eleanor of England+ b. 1215, d. 13 Apr 1275

Child of John I 'Lackland', King of England and Adela de Warenne

Richard Fitzroy, Baron of Chilham+8 b. b 1216, d. fr 1245 - 1246

Citations

[S11] Alison Weir, Britain's Royal Families: The Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 65. Hereinafter cited as Britain's Royal Families.
[S3409] Caroline Maubois, "re: Penancoet Family," e-mail message to Darryl Roger Lundy, 2 December 2008. Hereinafter cited as "re: Penancoet Family."
[S11] Alison Weir, Britain's Royal Families, page 66.
[S11] Alison Weir, Britain's Royal Families, page 71.
[S79] Douglas Richardson, Plantagenet Ancestry (Baltimore, Maryland, U.S.A.: Genealogical Publishing Company, 2004), page 748. Hereinafter cited as Plantagenet Ancestry.
[S4] C.F.J. Hankinson, editor, DeBretts Peerage, Baronetage, Knightage and Companionage, 147th year (London, U.K.: Odhams Press, 1949), page 20 . Hereinafter cited as DeBretts Peerage, 1949.
[S18] Matthew H.C.G., editor, Dictionary of National Biography on CD-ROM (Oxford, U.K.: Oxford University Press, 1995). Hereinafter cited as Dictionary of National Biography.
[S105] Brain Tompsett, Royal Genealogical Data, online http://www3.dcs.hull.ac.uk/genealogy/royal/. Hereinafter cited as Royal Genealogical Data.
[S1916] Tim Boyle, "re: Boyle Family," e-mail message to Darryl Roger Lundy, 16 September 2006. Hereinafter cited as "re: Boyle Family."
[S37] BP2003 See link for full details for this source. Hereinafter cited as. [S37]

Families

SpouseLlywelyn ap Gruffydd (1223 - 1282)
FatherKing John I "Lackland" Plantagenet (1167 - 1216)
MotherAgatha de Ferrers ( - )