This book presents a comprehensive survey of historically attested relative clause constructions from a diachronic typological perspective. Systematic integration of historical data and a typological approach demonstrates how typology and historical linguistics can each benefit from attention to the other. The diachronic behaviour of relative clauses is mapped across a broad range of genetically and geographically diverse languages. Central to the discussion is the strength of evidence for what have previously been claimed to be 'natural' or even 'universal' pathways of change. While many feat.