Geoffrey I of Villehardouin was a French knight from the County of Champagne who joined the Fourth Crusade. He participated in the conquest of the Peloponnese and became the second prince of Achaea.
Under his reign, the Principality of Achaea... Wikipedia
Great grandchildren: Matilda of Hainaut and Isabella of Sabran
Children: Geoffrey II of Villehardouin and William of Villehardouin
Grandchildren: Isabella of Villehardouin and Margaret of Villehardouin
Partner: Elisabeth (de Chappes)
Parents: Céline and Jean de Villehardouin, Seigneur de Brandonvillers
Successor: Geoffrey II