Found this on Jean Heimann’s excellent Catholic Fire blog. It is an excellent bio of St. Bruno, founder of the Carthusians, and includes important information such as:
– Bruno was one of the most remarkable scholars and teacher of his time: “…a prudent man whose word was rich in meaning.”
– His Order enjoys the distinction of never becoming unfaithful to the spirit of its founder, never needing a reform.
– St. Bruno is the patron of diabolic possession and Ruthenia.
You can read the entire bio here. Here is a translation of St. Bruno’s famous letter to his friend Raoul Le Verd. And this link takes you to several prayers to St. Bruno.