This book provides a comprehensive overview of the relationship between Indonesia and Malaysia, focusing especially on how the relationship has developed in the last fifty years. It argues that the political relationship between the two countries has been largely defined by rivalry, despite the fact that the processes of national self-determination began by emphasising Indo-Malay fraternity. It shows how the two countries have different, contested interpretations of Indo-Malay history, and how the continuing suspicion of Javanese hegemony which defined much of the history of the Indo-Malay world is also a key factor in the relationship.