This book addresses fundamental issues in linguistic theory, including the relation between formal and cognitive approaches, the autonomy of syntax, the content of universal grammar, and the value of generative and functional approaches to grammar. It focuses on the grammar of case relations, signalled by morphological case, prepositions, and word order. Part I offers a critical history of modern grammars of case, focussing on the last four decades and setting this in the context of earlier, including ancient, developments.