Marzbān, or Marzpān (Middle Persian: 𐭬𐭫𐭱𐭰𐭠𐭭𐭯 transliteration: mrzwpn, derived from Middle Persian: 𐭬𐭫𐭱 marz "border, boundary" and the Middle Persian suffix: 𐭡𐭭𐭯 -pān "guardian"; Modern Persian: مرزبان Marzbān) were a class of , 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 Iran.
The word marzban was borrowed into Armenian as marzpan (մարզպան) and into Georgian as marzapani (მარზაპანი).
The title marzbān can be dated to the Parthian Empire, where in the frontier areas such as Nisa (1st century BC) are found titles mrzwpn (marzban), probably an officier in charge of the frontier troops, and dyzpty, an officier in charge of a fort. Some scholars consider that marzbāns existed during the reign of Darius I (550–486 BC) of the Achaemenid Empire. There is some uncertainty for the exact relationship between titles marzbān, Spahbed, Kanarang, pāygōsbān (Parthian ptykwspn, Sasanian paygospān or padhospān) and ostāndār. The historical sources blur the distinction between the marzbān and spāhbed (army general or military governor), implying marzbān was a military title strictly limited to the frontier marches and provinces. The least clear is the distinction with kanārang, apparently an East-Iranian derivation of marzbān in the province Abarshahr in Central Asia. The pāygōsbān, meaning "guardian of the district", is an uncertain title, seemingly provincial military commanders or governors, while the marzbān meant "guardian of the borders, provinces". Perhaps the pāygōsbān lacked civilian duties. The ostāndār was the governor of an ostān (province or district within a province).
The primary sources imply the marzbān was a provincional function practiced for a single or multiple provinces, but there is no evidence for a "quarter of the empire", as al-Masudi entitled Shahrbaraz (629 AD). The rank of marzbān, like most imperial administration, was mostly patrimonial, and was passed down through a single family for generations. The marzbāns of greatest seniority were permitted a silver throne, while marzbāns of the most strategic border provinces, such as the province of Armenia, were allowed a golden throne. In military campaigns the regional marzbāns could be regarded as field marshals, while lesser spāhbeds could command a field army.
The function of marzbān changed over the years, with smaller territorial units being part of the civil administration. In the early years the main marzbān regions were Persian Armenia, Beth Aramaye, Pars, Kirman, Spahan, Adurbadagan, Tabaristan, Nishapur County, Tus, Sakastan, Mazun, Harev, Margiana and Sarakhs, several mentioned belonging to the Greater Khorasan. Some regions enjoyed considerable autonomy while other were militarily more important, for example the Adurbadagan facing the Caucasus was special military frontier.
Marzbāns were granted the administration of the border provinces and were responsible for maintaining the security of the trade routes, fighting the encroaching nomadic tribes such as Bedouin, and Oghuz Turks, and holding the first line of defense against settled enemies such as Ancient Rome and Kushan Empire. During the reign of Khosrow I (531–579 AD) were held military reforms by which were created four frontier regions (Khwarasan, Khwarwaran, Nemroz, Adurbadagan) with spāhbed in charge, sometimes still called as marzbān, but now generally considered for more central provinces. Also, the previous gentry rank dihqānān was moulded into influential "nobility of service" which became the backbone of the Sasanian state. However, this measures of centralization caused the transfer of the power to the military (the dihqānān gradually became more independent from the government, while the four large spāhbed territories quasi-independent fiefs), and led to the eventual disintegration of the Empire.
The Sasanian social, administrative and military structure and system was inherited by the Medieval Islamic civilization, however, the marzbāns steadily disappeared depending on the region, as such in Iraq diminished and were replaced by Muslim frontier warriors muqātila, while in Khorasan still had special privileges. In generally were replaced by the title dihqānān.
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