Guy I, Count of Ponthieu

Guy I of Ponthieu (also known in the Bayeux Tapestry as Wido) was born sometime in the mid to late 1020s and died 13 October 1100. He succeeded his brother Enguerrand as Count of Ponthieu.

Guy was a younger son of Hugh II, Count of Ponthieu and about 1053 succeeded his brother Enguerrand II, as Count of Ponthieu. The Ponthievin alliance with Duke William of Normandy had earlier been secured by the marriage of Enguerrand to Adelaide of Normandy, Duke William's sister. But the marriage was apparently annulled due to consanguinity c.1149/50. Enguerrand's and Guy's sister was married to William of Talou, son of Richard II, Duke of Normandy. William of Talou had built a strong castle at Arques, and from it (in 1053) he defied his nephew the youthful Duke of Normandy. As "family", the comital house of Ponthieu supported the rebellion.

Duke William put Arques under siege, and then remained mobile with another force in the countryside nearby. He was aware that Normandy was being threatened by the armies of King Henry of France, who wanted to bring his young, former vassal to heel; and that Normandy's erstwhile allies from Ponthieu would also be coming to break the siege of Arques. Young Count Enguerrand led a Ponthievin army into the Talou to relieve Arques, and arrived first, but Duke William successfully ambushed them and Enguerrand was killed (legend says, within sight and sound of the walls of Arques, from which his sister witnessed the demise of her brother). Upon learning of this serious reverse, the vacillating Henry withdrew his forces at once back across the Norman border. William of Talou was compelled to surrender Arques and was banished for life. (Alternatively, the story goes that Henry reinforced Arques, and Duke William lured part of the French army, including Enguerrand and the Ponthievins, away by a feigned flight, then turned on them and won a battle: Henry then withdrew, forcing the surrender of Arques not long after.)

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