St. Nilus must be counted as one of the leading ascetic writers of the 5th century. His feast is kept on November 12th in the Byzantine Calendar; he is commemorated also in the Roman Martyrology on the same date. St. Nilus probably died around the year 430, as there is no evidence of his life after that… His numerous works, including a multitude of letters, consist of denunciations of heresy, paganism, abuses of discipline and crimes. He also wrote about rules and principles of asceticism, especially maxims on the religious life. He warns and threatens people in high places, Abbots and Bishops, Governors and Princes, even the Emperor himself, without fear.