The Carthusian Order is a monastic order that was founded in 1084 by St. Bruno of Cologne. Known for their strict adherence to the Rule of St. Benedict, the Carthusians are a contemplative order known for their solitary and silent lifestyle. There are various synonyms for the Carthusian Order, including the Charterhouse and the Order of St. Bruno. The Charterhouses are the monasteries or priories of the Carthusians, and they are spread throughout the world. The Carthusian Order is one of the smallest and most austere orders in the Catholic Church, with only a few hundred members worldwide. Despite this, they have made significant contributions to the Church and society through their prayerful and contemplative way of life.