Odo (or Eudes) the Good Marquis (fl. 11th century), sometimes called Odobonus,[1] was a Norman or Lombard nobleman who ruled an unknown region of southern Italy. He married Emma, a daughter of Robert Guiscard, and they had at least three sons, Tancred and William, both famous crusaders, and Robert, as well as a daughter (name unknown) who married Richard of Salerno. Odo is known only in connection to his wife and sons.[2]