Abu Salih Mansur (Persian: ابو صالح منصور‎, romanized: Abu Ṣāliḥ Manṣur; died 13 June 976), better known as Mansur I (منصور) was amir of the Samanids from 961 to 976. The son of Nuh I (r. 943–954), his reign was characterized by weak rule and perpetual financial troubles. Mansur was notably the first Samanid ruler to the use title of King of Kings (shahanshah), most likely as a response to his rival, the Buyid ruler Rukn al-Dawla, who likewise used the title.[1]