While comparative studies on purity and impurity presented in the last decades have mostly concentrated on the ancient world or on modern developments, this volume focusses the hitherto comparatively neglected period between ca. 300 and 1600 c. E. The collection is innovative because it not only combines papers on both European and Asian cultures but also considers a wide variety of religions and confessions. The articles are written by leading experts in the field and are presented in six systematic sections. This analytical categorization facilitates understanding the functional spectrum that the binomial purity and impurity could cover in past societies. The volume thus presents an in-depth comparative analysis of a category of paramount importance for interfaith relations and processes of transfer.