In the eleventh century, a Breton monk named Theobaldus built for pilgrims and travelers a "Hostellerie priory", at a place called Pre Chartreux between the Gencourt and the Poulemonts.
Full name Saint-Thibaud-de-Couz is mentioned for the first time in Latin in 1497 in the cartulary Labaudie "Parrochia Sancti theobaldi de Couz".