Sakastan (also known as Sagestān, Sagistan, Seyanish, Segistan, Sistan, and Sijistan) was a Sasanian province in Late Antiquity, that lay within the kust of Nemroz.

240, during the reign of Shapur I (r. 240–270), as part of his intention to centralise his empire - before that, the province was under the rule of the Parthian Suren Kingdom, whose ruler Ardashir Sakanshah became a Sasanian vassal during the reign of Shapur's father Ardashir I (r. 224–242), who also had the ancient city Zrang rebuilt, which became the capital of the province.

Peroz I (r. 459–484), during his early reign, put an end to dynastic rule in province by appointing a Karenid as its governor.

[4] During the Muslim conquest of Persia, the last Sasanian king Yazdegerd III fled to Sakastan in the mid-640s, where its governor Aparviz (who was more or less independent), helped him.

However, Yazdegerd III quickly lost this support when he demanded tax money that Aparviz had failed to pay.

During the Achaemenid period, Sakastan (then known as Drangiana), was populated by a Persianized east Iranian group known as the Drangians.

From the first reign of Kavad I (r. 488–496) onwards, this mint was located at the provincial capital Zrang (mint-mark: ZR, ZRN, ZRNG).