This article considers the sermons preached by royal chaplains at the court of James II and the organisation of the chapel royal by James as a Catholic organisation. In doing so, it addresses the question of where James’s assurance and certainty came from that he was ruling as God wished him to do. The evidence presented here is that James organised his Catholic chapel royal to be a conscious source of guidance and support. His chaplains reciprocated by addressing him as a Catholic king whose duty was to bring to heel a recalcitrant and stubborn people. His chaplains used historical precedent and theological argument to press on James his determination to bring his Protestant subjects to obedience. This is a study of the Catholic milieu of James’s court and of the theological impetus behind his rule.