Šahrestānīhā ī Ērānšahr in the context of Sakastan (Sasanian Province)

Abarshahr (Persian: اَبَرشهر) or Nishapur (Persian: نیشاپور) was a Sasanian satrapy (province) in Late Antiquity, that lay within the kust of Khorasan. The province bordered Media in the west, Hyrcania in the north west, Margiana in the north east, and Harev in the south east. The governor of Abarshahr is attested to have held the unique title of kanarang, distinguished from the title of marzban given to governors of frontier provinces. Abarshahr came to be known as one of the nicknames of the city of Nishapur which was considered to be the capital city of the province of Abarshahr during the Sassanian period and later on.

Rostam Farrokhzād (Persian: رستم فرخزاد) was a dynast from the Ispahbudhan family, who served as the spahbed ("military marshal") of the northwestern quarter (kust) of Adurbadagan under the Sasanian monarchs Boran (r. 630–630, 631–632) and Yazdegerd III (r. 632–651). Rostam is remembered as a historical figure, a character in the Persian epic poem Shahnameh ("Book of Kings"), and as a touchstone of many Iranian nationalists.