Abu Muhammad Ziyadat Allah I ibn Ibrahim ibn al-Aghlab was the Aghlabid ruler (amir) of Ifriqiya from 817 until his death in 838. His reign marked a shift towards greater control and stability for the emirs in Ifriqiya.

The Aghlabids were an Arab dynasty centered in Ifriqiya from 800 to 909 that conquered parts of Sicily, Southern Italy, and possibly Sardinia, nominally as vassals of the Abbasid Caliphate. The Aghlabids were from the Najdi tribe of Banu Tamim and adhered to the Mu'tazilite rationalist doctrine within Hanafi Sunni Islam, which they imposed as the state doctrine of Ifriqiya. They ruled until 909 when they were conquered by the new power of the Fatimids.