At Gunde-Shapur in this region " sugar was prepared with art " about the time of the Arab conquest, 3 and manufacture on a large scale was carried on at Shuster, Sus and Askar-Mokram throughout the middle ages.4 It has been plausibly conjectured that the art of sugar refining, which the farther East learned from the Arabs, was developed by the famous physicians of this region, in whose pharmacopoeia sugar had an important place.
The new pretender entered Fars and Ahwaz (Susiana), and it was in this last province near Tostar (Shuster) that Hajjaj came up with him, after receiving from Syria the reinforcements which he had demanded in all haste from the caliph.
In 1877 plague also occurred at Shuster in south-west Persia, probably conveyed by pilgrims returning from Irak, and caused great mortality.
His nephew Shah Walad reigned for a few months only and the throne was occupied by his widow Tandu, formerly wife of Barkuk, who ruled over Basra, Wasit and Shuster till 1416, paying allegiance to Shah Rukh, the second Timurid ruler.
The Yezd opium is considered better than that of Ispahan, but the strongest or Theriak-e-Arabistani is produced in the neighbourhood of Dizful and Shuster, east of the river Tigris.
The Shuster opium is sent partly via Bushire to Muscat for transhipment to Zanzibar, and part is believed to be smuggled into India by way of Baluchistan and Mekran.