Julian of Norwich (c. November 8, 1342 – c. 1416) is consiered to be one of the greatest English mystics. Little is known of her life aside from her writings. Even her name is uncertain, the name "Julian" coming from the Church of St Julian in Norwich, where she was an anchoress, meaning that she was walled into the church behind the altar during a mass for the dead. At the age of thirty, suffering from a severe illness and believing she was on her deathbed, Julian had a series of intense visions. (They ended by the time she overcame her illness on May 13, 1373.) She recorded these visions soon after having them, and then again twenty years later in far more theological depth. They are the source of her major work, called Sixteen Revelations of Divine Love (circa 1393). This is believed to be the first book written by a woman in the English language. Julian became well known throughout England as a spiritual authority: Margery Kempe mentions going to Norwich to speak with Julian.