Ashtat Yeztayar was an Iranian military officer under what last great king of the Sasanian Empire, reigning from 590 to 628?
Khosrow II Khosrow II (Chosroes II in classical sources; Middle Persian: "Husrō(y)"), entitled "Aparvēz" ("The Victorious"), also Khusraw Parvēz (New Persian: خسرو پرویز ), was the last great king of the Sasanian Empire, reigning from 590 to 628.
Spahbed Spāhbed (Middle Persian: 𐭮𐭯𐭠𐭧𐭯𐭲 ; also spelled spahbod and spahbad, early form spāhpat) is a Middle Persian title meaning "army chief" used chiefly in the Sasanian Empire Originally there was a single "spāhbed", called the "Ērān-spāhbed", who functioned as the generalissimo of the Sasanian army. From the time of Khosrow I (r. 531–579) on, the office was split in four, with a "spāhbed" for each of the cardinal directions. After the Muslim conquest of Persia, the "spāhbed" of the East managed to retain his authority over the inaccessible mountainous region of Tabaristan on the southern shore of the Caspian Sea, where the title, often in its Islamic form ispahbadh (Persian: اسپهبذ‎ ‎ ; in Arabic: اصبهبذ‎ ‎ "işbahbadh"), survived as a regnal title until the Mongol conquests of the 13th century. An equivalent title of Persian origin, "ispahsālār", gained great currency across the Muslim world in the 10th–15th centuries.