Jalal al-Dawla Iskandar was the ruler (ustandar) of the Baduspanids from 1333 to 1360. Under his rule, the kingdom reached its zenith. Taking advantage of the collapse of the Mongol Ilkhanate in 1335, he expanded his rule into the southern Alborz, ruling an area stretching from Qazvin to Simnan. In 1346, he founded the town of Kojur and conquered the region of Daylam. In 1360, he was mortally wounded by his bodyguard during a ruckus at a drinking party. He died three days later, and was succeeded by his brother Fakhr al-Dawla Shah-Ghazi.