Certain families gained a reputation for providing multiple generations of scholars. For example, the Saghanughu clan was a "dyula" lineage living in Northern and Western Ivory Coast and parts of the Upper Volta. This lineage may be traced to Timbuktu, but its principal figure was Sheikh Muhammad al-Mustafa Saghanughu (d. 1776), the "imam" of Bobo-Dyulasso. He produced an educational system based on three canonical texts of Quranic commentary ("tafsir") and "hadith". His sons continued spreading their father’s teachings and expanded through towns in Ghana and the Ivory Coast, founding Islamic schools, or madaris, and acting as "imams" and "qadis".