''Ostandar'' or ''Ustandar'' was an administrative title wielded by provincial governors under the

Sasanian Empire The Sasanian () or Sassanid Empire, officially known as the Empire of Iranians (, ) and also referred to by historians as the Neo-Persian Empire, was the History of Iran, last Iranian empire before the early Muslim conquests of the 7th-8th cen ...

. They governed the royal lands, known as the ''ostan''. The title was later assumed by the

Baduspanids The Baduspanids or Badusbanids ( fa, پادوسبانیان, Pâdusbâniân), were a local Iranian dynasty of Tabaristan which ruled over Ruyan/Rustamdar. The dynasty was established in 665, and with 933 years of rule as the longest dynasty in I ...

of Ruyan, starting with

Shahriyar III ibn Jamshid Shahriyar III ibn Jamshid was the Baduspanid ruler of Ruyan and Rustamdar from 937 to 949. He belonged to a distant branch of the family, descended from Afridun ibn Karan. After a period of instability and dynastic struggles, Shahriyar emerged vic ...

().

References

Sources

* * * * {{cite journal , last1=Miri, first1=Negin, title=Sasanian Pars: Historical Geography and Administrative Organization , journal= Sasanika , date=2012, pages=1–183 , url=https://www.academia.edu/27195855, url-access=registration Sasanian military offices Officials of the Sasanian Empire Baduspanids Persian words and phrases