Abu'l-Hasan Ali ibn al-Hasan (Persian: ابوالحسن علی بن حسن), better known by his laqab of Fakhr al-Dawla (Arabic: 'فخر الدولة, "Pride of the Dynasty") (died October or November 997) was the Buyid amir of Jibal (976–980, 984–997), Hamadan (984–997) and Gurgan and Tabaristan (984–997).
In addition to Ray, he now controlled Mu'ayyad al-Dawla's holdings of Hamadan, as well as the formerly Ziyarid lands of Gurgan and Tabaristan.
Taking the title of Shâhanshâh, he made Sahib ibn 'Abbad his vizier, and took his advice not to restore Qabus to his former territory.
This diplomatic success was of little consequence, however, as the two princes were relatively minor and were forced to seek refuge in Ray when Sharaf al-Dawla, who ruled in Fars, expelled them from their provinces.
Fakhr al-Dawla attempted to take advantage of their rivalry by invading Khuzestan, with the goal of cutting off Iraq from Fars.
Now the ruler of all of Buyid Iran, Fakhr al-Dawla, with the support of his vizier Sahib ibn 'Abbad, decided to undertake a campaign to seize Khurasan from the Samanids.
The vizier had played an important part in maintaining Fakhr al-Dawla's grip on Buyid Iran, and his loss was unfortunate.
Fakhr al-Dawla's death marked the beginning of the decline of the Buyids in northern Iran; shortly afterwards Qabus managed to restore Ziyarid rule to Gurgan and Tabaristan.