"Historians agree that the leaders of the new state were ancestors of the Kanembu people. Toward the end of the 11th century the Sayfawa king (or mai, the title of the Sayfawa rulers) Hummay, converted to Islam. In the following century the Sayfawa rulers expandeded southward into Kanem, where was to rise their first capital, Njimi. Kanem's expansion peaked during the long and energetic reign of Mai Dunama Dabbalemi (c. 1221–1259)."
In Chad, today's "History of" country.