William Firmatus was an eleventh-century Norman hermit and pilgrim who was born in Tours, in the Kingdom of France. Originally a physician and canon, he decided to renounce his wealth and distribute his belongings to the impoverished. He lived a secluded life with his mother before moving to a hermitage near Laval. He spent his later years traveling as a pilgrim and residing in hermitages at Mantilly and Savigny until his death in 1103.