As many pundits and politicians argue, Australia, Canada, New Zealand and the United Kingdom may be on the cusp of major constitutional change. As the reign of Queen Elizabeth draws to a close, both the role of monarchy and the Westminster system of constitutional monarchy are increasingly being called into question as anachronistic and no longer fit for purpose. Against a background of calls for constitutional reform this chapter asks, what is the Crown’s future? What can we conclude about its shapeshifting nature and divisibility? For whom is it a ‘convenient’ or useful fiction? We also explore how it embodies and personifies state authority and how people make sense of it in the different realms. Finally, we address the question of which realm is most likely to be the first to adopt a republican constitution. We address these questions from both theoretical and ethnographic perspectives. We highlight the Crown’s complex and sometimes contradictory meanings, the utility of its ambiguity and how its ability to bridge the sacred and the profane sustains its constitutional legitimacy.