He inherited the lordship of Dun and became viscount of Bourges between 1092 and 1095 after marrying Matilda of Sully, whose sister Alice was the daughter-in-law of Stephen, Count of Blois.
At some point between 1097 and 1101, Odo sold his possessions in Bourges and Dun to King Philip I of France for sixty thousand shillings.
He participated in the Crusade of 1101, probably with Stephen of Blois, and travelled through Constantinople, where he swore a loyalty oath to Byzantine emperor Alexios I Komnenos.
He became prior of La Charité-sur-Loire around 1107, and added the revenues of numerous other properties to the monastery, including one in Anatolia donated by Emperor Alexius.
Odo's capture was incorporated into the Crusade cycle of epic poetry, in the section known as Les Chétifs ("the captives").