The term Arch-Provost can apply to a variety of governing positions, often in place of a monarch or in control of a large jurisdiction.
One planet known to have an Arch-Provost was Rendili. In 22 BBY, having been impressed by the design of the Acclamator-class assault ship, Arch-Provost Bengila Urlan ordered industrial spies and starship designers to make efforts to reduce Kuat's lead for new contracts handed out by the Galactic Republic. Eventually, these plans would culminate in the Victory-class Star Destroyer. Arch-Provost Urlan was additionally successful in luring Kuat Drive Yards' top shipwright, Walex Blissex, away from KDY to Rendili StarDrive.