This volume explores and analyses the effects of religious conversion on landscapes of cult and on religious practice in Europe c. AD 350-1100, 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, the power of belief 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 (2011-2013) funded by the Leverhulme Trust and forms a companion volume to The Introduction of Christianity into the Early Medieval Insular World.