Ali IV Kalirgima
| Ali IV Kalirgima | |
|---|---|
| Mai of the Kanem–Bornu Empire | |
| Reign | 18th century (40–46 years) c. 1750–1791 |
| Predecessor | Dunama VIII Gana |
| Successor | Ahmad Alimi |
| Died | 1791 Ngazargamu, Bornu (?) |
| Spouse | Amina |
| Issue | Ahmad Alimi Muhammad IX Ngileruma |
| Dynasty | Sayfawa dynasty |
| Father | Hamdan Dunamami |
| Mother | Fanna |
Ali IV (ʿAlī bin Ḥamdūn), called Ali Kalirgima, Ali Gulmi, Ali Dunamami, and Ali Fannami, was mai (ruler) of the Kanem–Bornu Empire in the second half of the 18th century, ruling approximately 1750–1791. Ali is remembered for a series of unsuccessful wars against the Mandara Kingdom to the southwest, which greatly weakened the empire's armies.