This principle excluded Preventing_or_letting , or `` reserved Preserving '' , the ecclesiastical territories of the Holy Roman Empire from the application of `` cuius regio , eius religio '' , or `` whose rule , his religion '' , as the primary means of determining Deciding the religion of a territory .

The principle of `` cuius regio '' did not address Statement the emerging Coming_to_be trend toward religious pluralism ( co-existence within a single territory ) developing Cause_to_make_progress throughout the German-speaking lands of the Holy Roman Empire .