This second edition of Ian Roberts's highly successful textbook on diachronic syntax has been fully revised and updated throughout to take account of the multiple developments in the field in the last decade. The book provides a detailed account of how standard questions in historical linguistics - including word order change, grammaticalization, and reanalysis - can be explored in terms of current minimalist theory and Universal Grammar. This new edition offers expanded coverage of a range of topics, including null subjects, the Final-over-Final Condition, the diachrony of wh-movement, the Tolerance Principle, and creoles and creolization, and explores further advances in the theory of parametric variation. Each chapter includes suggestions for further reading, and the book concludes with a comprehensive glossary of key terms. Written by one of the leading scholars in the field, the volume will remain an ideal textbook for students of historical linguistics and a valuable reference for researchers and students in related areas such as syntax, comparative linguistics, language contact, and language acquisition.