Pierre-Joseph Cassant was a French Trappist monk and priest who lived from 1878 to 1903. Born in Casseneuil, he joined the Cistercian Order of the Strict Observance at Sainte-Marie du Désert, where he took the religious name Marie-Joseph. Despite facing significant learning difficulties during his studies, he remained determined to pursue the priesthood. He was ordained in 1902, shortly before succumbing to tuberculosis. He is recognized as a blessed in the Catholic Church, having been beatified by Pope John Paul II in 2004.