Geoffrey was the son of Geoffrey, Count of Gâtinais, and Beatrice of Macon. She was the daughter of Aubry II of Mâcon. He was born about the year 1000. The Gâtinais was a key district on the northeast border of Orléans and Château-Landon was the capitol. he married Ermengarde-Blanche of Anjou, daughter of Fulk III Nerra. Together they were the ancestors of the House of Plantagenet. 