Arteshtaran-salar

Arteshtaran-salar (strictly transliterated as "artēštārān-sālār", meaning "chief of the warriors") was a high office of the military of the Sasanian Empire.
According to al-Tabari, the rank was above "spahbed" and below "argbed" (which was reserved for the royal family members). According to Procopius, the bearer of the title (in Greek: "adrastadáran salánēs") was "a generalissimo invested with quite exceptional powers" in the 500s AD.
The Middle Persian titles "artēštārān-sālār" and "wāst(a)ryōšān-sālār" are both derived from the Avestan designations of the social classes "vāstryō-fšuyant" ("cattle-breeder") and "raθaēštā" ("warrior").
The first recorded bearer of the title is Kārd (or Kārdār), the third son of the chief minister Mihr-Narseh, per an account from "Khwaday-Namag". It is possible that the rank was established by Mihr-Narseh himself. According to Procopius, the office was held last by Siyawush. He claims that he was the first and only bearer of the title, but this is doubted.