During the reign of Sultan Ala'uddin (r. 1593–1639), the Makassarese of Gowa and Talloq initiated a new form of historical writing known as lontaraq bilang. This article argues that this genre represents an Islamic form of historical writing that simultaneously integrated distant places and events within the structure of Makassarese history and Makassarese people and practices within the umma and the structure of Islamic history. Examining this islamisation of history writing yields new insight into premodern Makassarese notions of empire, social change, and religious identity. Lontaraq bilang are an important source of insight into how Makassarese grappled with what it meant to be Muslim and how processes of islamisation were transforming (or should ideally transform) their society.