Conversion to Christianity is arguably the most revolutionary social and cultural change that Europe experienced throughout Late Antiquity and the early Middle Ages. Christianization affected all strata of society and transformed not only religious beliefs and practices, but also the nature of government, the priorities of the economy, the character of kinship, and gender relations. It is against this backdrop that an international array of leading medievalists gathered under the auspices of the Converting the Isles Research Network (funded by the Leverhulme Trust) to investigate social, economic, and cultural aspects of conversion in the early medieval Insular world, covering different parts of Britain, Ireland, Scandinavia, and Iceland. This volume analyses the effects of religious conversion on landscapes of cult and on religious practice in Europe, focusing in particular on Britain and Ireland. Adopting an interdisciplinary and comparative approach, the volume investigates the interaction between different forms of belief, their coexistence and competition. It discusses the coming of writing, the power of the word, landscapes of ritual, and converting communities. The contributors include leading historians, archaeologists, linguists, and literary scholars. This is the second volume to emerge from research undertaken by contributors to the Converting the Isles Research Network and forms a companion volume to The Introduction of Christianity into the Early Medieval Insular World.