Guy II of Ponthieu (–25 December 1147) was the son of William III of Ponthieu and Helie of Burgundy. Life He succeeded his father as Count of Ponthieu before 1129; this was during William's lifetime. Around 1137, he founded the Cistercian Valloires Abbey. He joined the Second Crusade under King Louis VII of France, and died of a disease on 25 December 1147 in Ephesus. He was succeeded by his son John I of Ponthieu.

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