Guigo I also known as Guigues du Chastel was a Carthusian monk and the 5th prior of Grande Chartreuse monastery in the 12th century, i.e. the 5th successor of Saint Bruno. He died about 1136, and is distinct from Guigo II, the 9th prior of the same monastery.
He was a man of considerable learning, was known for his eloquence and great memory. He was a close friend of St. Bernard of Clairvaux and of Peter the Venerable, both of whom wrote of Guigo's sanctity.
- The Meditations of Guigo I, Prior of the Charterhouse (Cistercian Studies Series ; No. 155) 1994 ISBN 978-0-87907-655-9
See also 
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