Wikipedia
Marzban
Marzbān, or Marzpān ( Middle Persian transliteration: mrzwpn, derived from marz "border, boundary" and the suffix -pān "guardian"; Modern Persian: Marzbān) were a class of margraves, warden of the marches, and by extension military commanders, in charge of border provinces of the Parthian Empire (247 BC–224 AD) and mostly Sasanian Empire (224–651 AD) of Persia.