Abu Tahir Jalal al-Daula (993 or 994 – March 1044) was the Buyid amir of Iraq (1027–1044). He was the son of Baha' al-Daula.
In 1012 Jalal al-Daula's father died. His brother, Sultan al-Daula came to the throne and appointed him as governor of Basra. He ruled there up until Musharrif al-Daula, who had taken control of Iraq, died in 1025. His death caused a succession crisis. The army took more than two years before choosing Jalal al-Daula as his successor in June 1027. He subsequently became involved in a bitter fight with his nephew Abu Kalijar, who controlled Fars and Kerman. The two Buyids were not always enemies; for example, Jalal al-Daula provided support to Abu Kalijar when the Ghaznavids invaded Kerman in 1033.
Jalal al-Daula was however also forced to deal with problems in his own realm, which consisted of little more than Baghdad and Wasit following Abu Kalijar's seizure of Basra. His army was continually hostile, a situation which devolved to the point where the caliph often acted as a mediator between the amir and his troops. A mutiny led by a Turk named Barstoghan in 1036 or 1037 was therefore not surprising. The revolt provided Abu Kalijar with an opportunity to invade. He failed to take Baghdad, but gained Jalal al-Daula's allegiance. The latter, however, had the support of the Uqailid amir of Mosul and the Arab tribe of the Asadids, and he was soon restored to his full power as an independent ruler. Jalal al-Daula continued his rule in Iraq until his death in 1044, following which Abu Kalijar managed to gain control of Iraq.
| Preceded by Musharrif al-Daula |
Buyid Amir (in Iraq) 1027–1044 |
Succeeded by Abu Kalijar |