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. 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. His twin was shortly blinded and imprisoned. However, when much of Mas'ud's western domains had been wrested from his control, his troops rebelled against him and reinstated Mohammad to the throne.
Öljei Temür Khan Öljei Temür Khan, Bunyashir Khan (full name: Bunyashiri, died 1412) was the Mongol khan of the Northern Yuan dynasty based in Mongolia. He was a son of Elbeg Nigülesügchi Khan and younger brother of Gün Temür Khan. He was one of the Borjigin princes, such as Tokhtamysh and Temur Qutlugh, backed by Tamerlane to seize the throne.