Peter Tudebode was a Poitevin priest who was part of the First Crusade as part of the army of Raymond of Saint-Gilles. He wrote an account of the crusade, Historia de Hierosolymitano itinere, including an eye-witness account of the Siege of Antioch, edited in volume 155 of the Patrologia Latina.
The anonymous Gesta Francorum is often assumed to be derived from Tudebode's account, but Rubenstein (2005) suggests that both derive from a lost common source.