Odo I, Count of Vermandois

Odo I (Eudes I), called “the Foolish” (fatuus), was the ruler of Saint-Simon. The last Carolingian male (from its branch Herbertines), he was the only son of Herbert IV, Count of Vermandois and Adele of Valois.

Following the marriage of his sister, Adelaide, Countess of Vermandois, to Hugh, Odo was disinherited and Hugh inherited Vermandois.