Heinrich Barth,
Travels and discoveries in North and Central Africa
(1890)
“ The Bórnu empire (if we may give the name of empire to the shattered host of a belligerent tribe driven from their home and reduced to a few military encampments) for the next seventy years seemed likely to go to pieces altogether, till the great king ʿAli Dúnamámi opened another glorious period; for having at length mastered the aristocratical element, which had almost overwhelmed the monarchy, he founded as a central point of government a new capital or “bírni,” Ghasréggomo, the empire having been without a fixed centre since the abandonment of Njímiye. ”
