Thierry du Mont d'Hor was a 6th-century abbot and priest who lived in the region near Reims, in the Kingdom of France. A devoted disciple of Saint Remigius, he eventually established a monastery on the forested Mont d'Or after receiving guidance from a holy woman named Susanna. Though he initially married to satisfy his family, he chose a life of celibacy and monasticism, leading his former bride to also enter the religious life. He is remembered for his spiritual zeal and for converting many sinners to the faith.