This former kingdom was mostly located in an undulating valley, with a population estimated in 1880 of about 15,000-16,000; its extent is roughly the same as the modern woreda of Gomma.

[2] Also located in the kingdom of Gomma were two hills, Sinka and Bemba (the last was also called Kella Egdu Biya, or "Gate of the Watching of the Land"), which were sacred to the Oromo.

"[4] Beckingham and Huntingford trace the foundation of Gomma to a miracle-worker who was named Nur Husain or Wariko, said to have come from Mogadishu.

[5] Hassen explains the tradition around Nur Husain as reflecting the fact that "Gomma was the first state in the Gibe region where Islam became the religion of the whole people.

Abba Manno was later able to annex Qattu during his reign (c. 1820 - 1840), and promoted Islam by patronizing Muslim religious teachers, as well as enhancing the activities of the Qadiriya order.