mysteriarch

The story

1. Ancient Greek · derived fromμυστηριάρχης“one who rules over religious mysteries”
2. Ecclesiastical Latin · borrowed frommystēriarchēs“one who presides over Christian sacraments”
3. English todaymysteriarch

Borrowed from Ecclesiastical Latin mystēriarchēs (“one who presides over Christian sacraments”), from Ancient Greek μυστηριάρχης (mustēriárkhēs, “one who rules over religious mysteries”), from μυστήριον (mustḗrion) + -άρχης (-árkhēs), corresponding to mystery + -arch.