<!doctype html public «-//w3c//dtd html 4.0 transitional//en»> http-equiv=content-type> What drew Martin Luther to the “Frankfurter” – at first sight, an undistinguished late Medieval treatise? Starting from this question, the monograph takes us back to the 14th century. It reveals how the “Frankfurter” earned its unique philosophical and theological reputation through its involvement in transformation processes within “mystical discourse,” making it akin to Luther’s theological anthropology.