How did Saint Cloud become saint?

Cloud as a spiritual student of Saint Severinus the Hermit. While still young he withdrew to Provence to live as a prayerful hermit, but when his identity became known, his hermitage became a destination point for pilgrims, and he returned to Paris. He was a priest and built a monastery near Paris, a house later known as Saint Cloud. He retired there, and led a community of holy brothers by his example. The town of Saint Cloud grew up around the monastery.