Odo took part in Theobald I of Navarre's Crusade of 1239-1240 but there were tensions between Theobald and local barons including Odo. However, the treaty between Theobald and the sultan of Damascus in 1240 gave Galilee back to the Kingdom of Jerusalem, and as Odo of Montbéliard was titular Prince of Galilee (by right of his marriage to Eschiva of Saint-Omer), he now took up the rule of Galilee.