Hasan ibn Ustadh-Hurmuz

Abu Ali Hasan ibn Ustadh-Hurmuz (Arabic: أبو علي حسن بن أستاذ هرمز), commonly known after his father as Ibn Ustadh-Hurmuz (ابن أستاذ هرمز) (died 1011) was a Daylamite[1] military officer of the Buyids, and an important figure in the Buyid state during the late 10th century.

He, however, died himself one year later, and was succeeded by his younger brother Baha' al-Dawla in Iraq, while Samsam al-Dawla managed to escape from captivity and fled to Fars, where he managed to conquer the entire region, and was joined by Ibn Ustadh-Hurmuz including other of his former officers such as Fuladh ibn Manadhar.

Ibn Ustadh-Hurmuz quickly used the opportunity to transfer his allegiance to Baha' al-Dawla,[2][3] who became the new ruler of Fars.

[4] He also defended Iraq against incursions from Batihah and the Hasanwayhid ruler Badr ibn Hasanwayh.

Furthermore, Ibn Ustadh-Hurmuz managed to suppress the rebellion of the Uqaylid ruler Qirwash, who had briefly taken control of a few Buyid cities and had changed his allegiance to the Fatimid Caliphate.