Najaf-Qoli Khan Bakhtiari ( Persian : نجف‌قلی‌خان بختیاری ; 1846–1930) also known as Saad al-Dowleh (سعدالدوله) and Samsam al-Saltaneh (صمصام‌السلطنه), was an Iranian Prime Minister and a leader of the Iranian Constitutional Revolution . He was elected Prime Minister for two terms, first from 3 May 1909 to 16 July 1909 and again from 23 December 1912 to 17 January 1913, when he resigned from the office. He was a representative of Parliament of Iran from Tehran in the 4th Parliament. He was the older brother of Ali-Qoli Khan Bakhtiari , better known as Sardar Assad, Bibi Maryam Bakhtiari and Khosrou Khan Bakhtiari , Sardar Zafar. In 1930, he died in Isfahan .