Synonym of castellan: the lord of a castle; a caretaker entrusted to oversee a castle for its lord.
A steward or seneschal: a medieval agent given management of a feudal estate or charged with collecting fees; (obsolete, sometimes as ~ of Paradise or ~ of Heaven) a title of the archangel Michael.
The head of various other ecclesiastical bodies, even (rare, obsolete) muezzins.
A dean: the head of a cathedral chapter.
A mayor: the chief magistrate of a town, particularly (Scotland) the head of a burgh or (historical) the former chiefs of various towns in France, Flanders, or (by extension) other Continental European countries.
The head of various colleges and universities.
Any manager or overseer in a medieval or early modern context.
The minister of the chief Protestant church of a town or region in Germany, the Low Countries, and Scandinavia.
A constable: a medieval or early modern official charged with arresting, holding, and punishing criminals.
An officer of the military police, particularly provost marshal or provost sergeant.
An assistant fencing master.
A senior deputy administrator; a vice-president of academic affairs.
A prior: an abbot's second-in-command.