Аха...Dominus is the Latin word for master or owner. As a title of sovereignty the term under the Roman Republic had all the associations of the Greek Tyrannos; refused during the early principate, it finally became an official title of the Roman Emperors under Diocletian (this is where the term dominate, used to describe a political system of Roman Empire in 284-476, is derived from). Dominus, the French equivalent being "sieur", was the Latin title of the feudal, superior and mesne, lords, and also an ecclesiastical and academical title. The ecclesiastical title was rendered in English "sir", which was a common prefix before the Reformation for parsons, as in Sir Hugh Evans in Shakespeare's Merry Wives of Windsor. The academical use was for a bachelor of arts, and so is still used at the University of Cambridge and other universities. The shortened form "dom" is used as a prefix of honor for ecclesiastics of the Roman Church, and especially for members of the benedictine and other religious orders.