Guilliaume de Champagne

WILLIAM de Blois prétendant au trône d'Angleterre jusqu'au traité de Wallingford.
[trans., William de Blois claiming the throne of England until the Treaty of Wallingford.]

Medlands: "Northern France: Artois, Boulogne, Guines, Saint-Pol": 3. GUILLAUME de Blois ([1132/37]-11 Oct 1159, bur hospital of Montmorillon, Poitou)... etc.

Medlands: "England, Kings 1066-1837":
([1132/37]-11 Oct 1159, bur hospital of Montmorillon, Poitou). The Chronicle of Alberic de Trois-Fontaines names "Eustacium et Guilelmum" as the two sons of "rex Anglorum Stefanus"[293].
His parentage is recorded by Matthew of Paris[294]. Earl of Warenne and Surrey, Lord of Pevensey and Norwich [1148/49], de iure uxoris[295].
He succeeded his brother in 1153 as GUILLAUME Comte de Boulogne. He was disinherited from the throne of England by his father in Nov 1153 under the treaty concerning the succession of Henry Plantagenet, although under its terms he was allowed to hold all lands which his father had held before becoming king, including the counties of Mortain and Boulogne, Eye and Lancaster[296].
He succeeded his father in 1154 as Comte de Mortain. He surrendered Pevensey, Norwich and other strongholds in England and Normandy to King Henry II in 1157. He was knighted by Henry II at Carlisle in 1158[297].
Robert of Torigny records that "Guillelmus comes Moritonii" died "1159 mense Octobris" while returning from serving in the Toulouse campaign, that he died without children and that King Henry II retained his county[298].
m (before 6 Nov 1153, maybe before [1148/49]%29 as her first husband, ISABELLE de Warenne, daughter & heiress of WILLIAM de Warenne 3rd Earl of Surrey & his wife Ela de Ponthieu (-[12 Jul 1203], bur Chapter House, Lewes).
Robert of Torigny records that "filiam tercii Guillermi de Warenna" married "Guillermus filius Stephani regis"[299].
Robert of Torigny records the marriage in 1164 of "Hamelinus naturalis frater regis Henrici" and "comitissam de Guarenna, relictam Willelmi comitis Moritoni filii Stephani regis, …filia tercii Willermi comitis de Guarenna"[300].
The primary source which confirms her name has not yet been identified.
She married secondly ([Apr] 1164) Hamelin d’Anjou, illegitimate son of Geoffroy V Comte d’Anjou.

en.Wikipedia: "William I, Count of Boulogne"

William I of Blois (c.1137 – 11 October 1159) was Count of Boulogne (1153-1159) and Earl of Surrey (1153-1159). He was the third son of King Stephen of England and Matilda of Boulogne.

When his elder brother, Eustace IV of Boulogne, died in 1153, William was passed over in the succession to England. His father instead conceded the throne to the young Henry Plantagenet. The new King Henry was quite generous in his treatment of William of Blois, confirming his possession of the Earldom of Surrey jure uxoris (in right of his wife).

However, Gervase of Canterbury asserts a plot against Henry's life was discovered in 1154 among some Flemish mercenaries. The plan was to assassinate Henry in Canterbury, and allegedly William of Blois had knowledge of this plot or was in connivance with the mercenaries. Whatever the truth, Henry fled Canterbury and returned to Normandy.

William of Blois had married Isabel de Warenne, 4th Countess of Surrey in her own right, in 1148. They had no children before his death in 1159. He died before the gates of Toulouse, and was buried at the Poitevin abbey of Montmorel. He was succeeded as Count of Boulogne by his sister Marie. His widow remarried to Hamelin Plantagenet.

Annals of Monte Fernando 1159: "Ob. Willelmus comes Bolonie."
Arms: Gules, three palets vair, on a chief or, an eagle displayed gules membered azure.

References
1. R. H. C. Davis (1967), King Stephen
2. Oxford Dictionary of National Biography (2004) "William, earl of Surrey (c.1135–1159)", Thomas K. Keefe

The Peerage, Database Online

William of Boulogne de Blois, 4th Earl of Surrey1
M, #102044, b. between 1132 and 1137, d. 11 October 1159
Last Edited=8 May 2006

William of Boulogne de Blois, 4th Earl of Surrey was born between 1132 and 1137.2 He was the son of Stephen de Blois, King of England and Matilda, Comtesse de Boulogne. He married Isabella de Warenne, daughter of William III de Warenne, 3rd Earl of Surrey and Ela Talvas, circa 1149.2 He died on 11 October 1159 at Toulouse, France, wounds in action.2 He was buried at Hospital of Montmorillon, Poitou, France.2
William of Boulogne de Blois, 4th Earl of Surrey gained the title of 4th Earl of Surrey in 1138, in right of his wife.1 He gained the title of Comte de Boulogne on 17 August 1153.2 He gained the title of Earl of Mortain on 25 October 1154.2 He gained the title of Comte de Mortagne. He gained the title of Earl of Warren. He fought in the siege of Toulouse in October 1159.2

Citations
1. Royal Genealogies Website (ROYAL92.GED), online ftp://ftp.cac.psu.edu/genealogy/public_html/royal/index.html. Hereinafter cited as Royal Genealogies Website.
2. Alison Weir, Britain's Royal Family: A Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 53. Hereinafter cited as Britain's Royal Family.

---

Books: Referencing

• Tanner, H. J. (2022) “The Twelfth-Century Norman and Angevin Duke-Kings of England and the Northern French Nobility,” in Church, S. D. (ed.) Anglo-Norman Studies XLIV: Proceedings of the Battle Conference 2021. Woodbridge, England, UK: Boydell Press, pp. 153-158+. Available at: WorldCat.org.
• Terry, B. S. (1901) “Part II: Feudal England; Chapter III: The Norman Reorganization of the Kingdom and the Introduction of Feudalism,” in A History of England from the Earliest Times to the Death of Queen Victoria. 4th ed. Chicago: Scott, Foresman and Company, p. 167. Available at:[ https://www.google.com/books/edition/A_History_of_England_from_the_... Google Books].
• McDougall, S. (2017) “Royal Bastards of the Twelfth Century: The Monk-King of Aragon’s Daughter, the Abbess-Countess of Boulogne’s Daughter, and Tancred of Lecce,” in Royal Bastards: The Birth of Illegitimacy, 800-1230. Oxford, England, UK: Oxford University Press, pp. 190–216. Available at: https://www.worldcat.org/title/964650329
• Dempsey, K. (2021) “Herstory: Exploring the Material Life of Gundrada de Warene,” in Bérat, E. O., Hardie, R., and Dumitrescu, I. (eds.) Relations of Power: Women’s Networks in the Middle Ages. Bonn, Germany: University Press, pp. 169–196. Available at: WorldCat.org and Google Books.
• Crouch, D. (2002) “Chapters 8-9: Stephen; The Norman Dynasty,” in The Normans: The History of a Dynasty. New York: Bloomsbury Academic, pp. 239–296. Available at: WorldCat.org.

  ---

William I of Blois (c.1137 – 11 October 1159) was Count of Boulogne (1153-1159) and Earl of Surrey (1153-1159). He was the third son of King Stephen of England and Matilda of Boulogne.

When his elder brother, Eustace IV of Boulogne, died in 1153, William was passed over in the succession to England. His father instead conceded the throne to the young Henry Plantagenet. The new King Henry was quite generous in his treatment of William of Blois, confirming his possession of the Earldom of Surrey jure uxoris (in right of his wife).

However, Gervase of Canterbury asserts a plot against Henry's life was discovered in 1154 among some Flemish mercenaries. The plan was to assassinate Henry in Canterbury, and allegedly William of Blois had knowledge of this plot or was in connivance with the mercenaries. Whatever the truth, Henry fled Canterbury and returned to Normandy.

William of Blois had married Isabel de Warenne, 4th Countess of Surrey in her own right, in 1148. They had no children before his death in 1159. He died before the gates of Toulouse, and was buried at the Poitevin abbey of Montmorel. He was succeeded as Count of Boulogne by his sister Marie. His widow remarried to Hamelin Plantagenet.

Annals of Monte Fernando 1159: "Ob. Willelmus comes Bolonie."

Arms: Gules, three palets vair, on a chief or, an eagle displayed gules membered azure.

When his elder brother, Eustace IV of Boulogne, died in 1153, William was passed over in the succession to England. His father instead conceded the throne to the young Henry Plantagenet. The new King Henry was quite generous in his treatment of William of Blois, confirming his possession of the Earldom of Surrey jure uxoris (in right of his wife).

However, Gervase of Canterbury asserts a plot against Henry's life was discovered in 1154 among some Flemish mercenaries. The plan was to assassinate Henry in Canterbury, and allegedly William of Blois had knowledge of this plot or was in connivance with the mercenaries. Whatever the truth, Henry fled Canterbury and returned to Normandy.

William of Blois had married Isabel de Warenne, 4th Countess of Surrey, in 1148. They had no children before his death in 1159. He died before the gates of Toulouse, and was buried at the Poitevin abbey of Montmorel. He was succeeded as Count of Boulogne by his sister, Mary I. His widow remarried to Hamelin Plantagenet.

Annals of Monte Fernando 1159: "Ob. Willelmus comes Bolonie."

Links

• https://www.unofficialroyalty.com/william-of-blois-count-of-boulogne/
• https://alchetron.com/William-I,-Count-of-Boulogne
• https://www.findagrave.com/memorial/34923152/william-i_count_of-bou...