I have to choose a 15th or early 16th century figure to research for my Modern Church History course. I really have my heart set on a mystic, I was thinking of Jeanne Guyon but she is born just a little too late. The ones that come readily to mind are: John of the Cross, Jakob Boehme and Theresa of Avila. I can only choose one and I would really like someone with a sense of Earthiness. I'm open to suggestions, I need to start some preliminary research soon.