Hummay, also called Ume or Umme Jilmi, is remembered as the first Muslim mai of Kanem, reigning around 1075 to 1086. The Diwan marks his reign as the point at which the ruling house embraced Islam, and it is from Hummay that all subsequent Muslim mais of Kanem and Bornu reckoned their descent. Dierk Lange reads the change as more than a conversion, arguing that Hummay's advent represents the supplanting of the older Duguwa (Zaghawa) kings by a new line. In the religious memory of the tradition he marks the threshold between the pre-Islamic sacral kingship and the Islamic monarchy that succeeded it, even as much older belief in the sanctity of the king's person persisted beneath the new faith.