The member of any sort of D/s relationship (whether Domestic Discipline, Devotional D/s, Adult Ageplay, etc) relationship who gives some measure of Authority to another, such as a Guardian.

This term is used as a convenient catch-all for the many different labels which different people relate to in various of these lifestyles, which we find have this common theme of finding emotional and sexual Power and Majesty from Backside Of Love relationships.