722), a tribe Ariaspae on the Etymandros (in Sijistan), who, on account of the support which they gave him against the Scythians, were called Euergetae (Arrian iii.
Other generals penetrated as far as the Indus and conquered Kabul, Sijistan, Makran and Kandahar.
When, in 697, Hajjaj gave the government of Khorasan to Mohallab, he committed that of Sijistan (Seistan) to Obaidallah b.
The command over Sijistan was now given to Abdarrahman b.
Not long after his arrival in Sijistan, Ibn Ash`ath, exasperated by the masterful tone of Hajjaj, the plebeian, towards himself, the high-born, decided to revolt.
The rebel then retired to Sijistan, and afterwards sought an asylum with the king of Kabul.
The distant provinces, with the exception of Sind and Sijistan, renounced the authority of the new caliph.
About this time Sijistan liberated itself from the supremacy of the Tahirids.
976) his successor Sabuktagin had conquered Bost in Sijistan and Qosdar in Baluchistan, beaten the Indian prince Diaya Pala, and been acknowledged as master of the lands west of the Indus.
At his death in 387 his son Mahmud conquered the whole of Khorasan and Sijistan, with a great part of India.