This chapter examines the theological function of the British coronation, highlighting its significance despite the modern United Kingdom’s religious diversity. Though the coronation is an overtly Christian ritual rooted in a time when the United Kingdom was largely homogeneous in faith, the ritual’s continuity underscores a historical and theological tradition integral to the monarchy’s identity. Beginning with early Christian coronations in Britain, the chapter outlines how the religious ethos shaped the monarchy’s role and authority, both pre- and post-Reformation, and how the sovereign’s anointing reflects a sacred dedication akin to ancient rites for rulers in Judaic, Byzantine, and mediæval European traditions. The coronation’s theological elements, including the invocation of divine approval and anointing by the Church, underscore the sovereign’s persona mixta—bridging sacred and secular realms. A Christian coronation maintains legitimacy by connecting with the United Kingdom’s constitutional framework, tradition, and historical identity. It also argues that while constitutional amendments could theoretically enable a secular or multifaith ceremony, this would represent a significant shift away from deeply embedded customs. The coronation’s theological function remains central, affirming the sovereign’s sacred and historical relationship to the United Kingdom and the Commonwealth realms.