Julian of Norwich is considered 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 occupied a cell adjoining the church as an anchoress. 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). These visions would twenty years later be 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.