The son of Rukn al-Dawla, Fanna Khusraw was given the title of Adud al-Dawla by the Abbasid caliph in 948 when he was made emir of Fars after the death of his childless uncle Imad al-Dawla, after which Rukn al-Dawla became the senior emir of the Buyids. In 974 Adud al-Dawla was sent by his father to save his cousin Izz al-Dawla from a rebellion. After defeating the rebel forces, he claimed the emirate of Iraq for himself, and forced his cousin to abdicate. His father, however, became angered by this decision and restored Izz al-Dawla. After the death of Adud al-Dawla's father, his cousin rebelled against him, but was defeated. Adud al-Dawla became afterwards the sole ruler of the Buyid dynasty and assumed the ancient Iranian title of Shahanshah ("King of Kings").