Shapur II (r. 309 - 379), after a successful campaign against several Arab tribes in Arabia, resettled some of them in different parts of his empire, such as Kirman, where he settled some Arabs in Aban. During the reign of Shapur III (r. 383 - 388), his son Bahram IV governed Kirman, where he built the town of Shiragan, which would serve as the capital of the province for the remainder of the Sasanian period. The town played an important economic role, as it served as a mint city and had a great agricultural importance to the province. Khosrow I (r. 531 - 579) had a large part of the turbulent Pariz tribe massacred and deported. Furthermore, during his reign Kirman was brought under a huge cultivation, where many large qanats were built. According to a legend, extensive planting of trees was also made. He also divided his empire into four military districts, known as kusts—Kirman became part of the Nemroz (southeastern) kust.