Baha' al-Daula

Baha' al-Dawla
Coin of Baha' al-Dawla
Amir of Iraq
Reign	988 – 1012
Predecessor	Sharaf al-Dawla
Successor	Sultan al-Dawla
Amir of Fars and Kerman
Reign	998 – 1012
Predecessor	Samsam al-Dawla
Successor	Qawam al-Dawla (in Kerman) Sultan al-Dawla (in Fars)
Born	Unknown 971
Died	December 22, 1012 Arrajan
Issue	Qawam al-Dawla Sultan al-Dawla Musharrif al-Dawla Jalal al-Dawla
Father	Adud al-Dawla
Religion	Shia Islam

Abu Nasr Firuz Kharshadh (died December 22, 1012), better known by his laqab of Baha' al-Dawla (meaning "Splendour of the State") was the Buyid amir of Iraq (988–1012), along with Fars and Kerman (998–1012). His early reign was dominated by struggles with his rival relatives over control of the western Persian provinces, but by 998 he managed to establish his supremacy over the Buyid confederation. His reign nevertheless saw the increasing encroachment of neighbouring powers on Buyid territory, and marks the beginning of the decline of the Buyids' power. He was the third son of 'Adud al-Dawla.

In 986, a Dailamite officer named Asfar ibn Kurdawayh rebelled against the ruler of Iraq, Samsam al-Dawla, and changed his allegiance to Sharaf al-Dawla. However, Asfar quickly changed his mind, and declared allegiance to the latter's other brother Abu Nasr Firuz Kharshadh, who was shortly given the honorific epithet of "Baha' al-Dawla." However, Samsam al-Dawla, with the aid of Fuladh ibn Manadhar, suppressed the rebellion, and imprisoned Baha al-Dawla. Samsam al-Dawla shortly made peace with Sharaf al-Dawla, and agreed to release Baha al-Dawla. Sharaf al-Dawla shortly betrayed Samsam al-Dawla, conquered Iraq, and had him imprisoned in a fortress.

Upon the death of Sharaf al-Dawla in 988, Baha' al-Dawla succeeded him, whereupon he took the additional title of Diya' al-Milla. Samsam al-Dawla, who managed to flee from prison, prevented Baha' al-Dawla from gaining all of Sharaf al-Dawla's possessions by taking control of Fars, Kerman and Khuzestan. Both Baha' al-Dawla and Samsam al-Dawla, however, were threatened by their granduncle Fakhr al-Dawla, the ruler of Jibal, who invaded Khuzestan in an attempt to drive a wedge between the two brothers' territories. This act prompted the brothers to draw up an alliance. Samsam al-Dawla recognized Baha' al-Dawla as the ruler of Iraq and Khuzestan, while he himself kept Arrajan, Fars and Kerman. Both promised to consider each other as equals, and took the title of king (malik). In 990, Baha' al-Dawla appointed Sabur ibn Ardashir as his vizier.