Ahmad Niyaltigin was the treasurer of a sultan who rose to power by seizing what from his younger twin?
Mas'ud I of Ghazni: Mas'ud I of Ghazni (Persian: مسعود غزنوی‎ ‎ ), known as Amīr-i Shahīd (امیر شهید ; "the martyr king")(998 – 17 January 1040), was "sultan" of the Ghaznavid Empire from 1030 to 1040. Mas'ud I of Ghazni:  He rose to power by seizing the Ghaznavid throne from his younger twin Mohammad, who had been nominated as the heir upon the death of their father Mahmud of Ghazni.
i don't know