Vicarius is a Latin word, meaning substitute or deputy. It is the root and origin of the English word "vicar." Originally, in ancient Rome, this was an equivalent to the English "vice-" (as in "deputy"), used as part of the title of various officials. Each vicarius was assigned to a specific superior official, after whom his full title was generally completed by a genitive (for example Vicarius Praetoris). Later, during the period of the Roman Empire known as the Dominate, a vicarius was the i… (More on Vicarius)