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.
Sökmen II Nāṣir al-Dīn Sökmen II (died 1185) was the "Shāh-i Arman", the ruler of the Turcoman principality centred on Ahlat, from 1128 until his death. He married Shāhbānū, daughter of ′Izz al-Dīn Saltuq II, ruler of Erzerum. He and his wife both engaged in major building projects that brought the Shāh-i Armanid state to its zenith.