This article analyses the system of sacred monarchy that maintained during the reign of King Narai of Ayutthaya (r. 1656-1688) in terms of a set of concepts designed to elucidate the relationship between religion and politics more generally in the pre-modern world. It argues that Ayutthayan kingship was unusually intensively sacralised in terms of two quite different modes simultaneously, the divinised and the righteous. These modes, both in themselves and in conjunction, produced somewhat paradoxical effects as well as forms of authority. The article thereby adopts a global perspective on Ayutthaya kingship while also offering some thoughts as to how and why it developed in the way it did and how Narai strove to manage the consequences.