William of Blois

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William I of Boulogne
Coat of arms of the county of Boulogne
Coat of arms of the county of Boulogne
Count of Boulogne
Reign 17 August 1153 – 11 October 1159
Predecessor Eustace IV
Successor Mary
Consort Isabel de Warenne, suo jure Countess of Surrey
Royal house House of Blois
Father Stephen of England
Mother Matilda I of Boulogne
Born c. 1137
Died 11 October 1159 (aged c. 22)
Toulouse, France
Burial Hospital of Montmorillon, Poitou

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 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.

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Preceded by
Eustace IV		 Count of Boulogne
1153–1159		 Succeeded by
Marie
Preceded by
Henry		 Count of Mortain
1153–1159