This collective volume examines the concept, theory, practice, and representations of the liturgy in the Middle Ages, including its sacramental developments, its religious and political implications, its forms of ritualization, and its doctrinal presumptions. It aims to create a space for interdisciplinary dialogue between history, theology, canon law, art history, political philosophy, and symbolic anthropology. It privileges the examination of the transferences between the spiritual and the temporal, the sacred and the profane, the political and the religious.