Frank William Walbank (1909–2008) was a renowned ancient historian and classicist. In this book, which was formed from The Hare Prize Essay for 1939 and first published in 1940, Walbank presents a detailed discussion of the reign of Philip V of Macedon. The text was intended to break fresh ground 'with a study of Philip, not solely as a figure in the history of Roman imperialism, but, as far as is feasible, from the aspect of Macedon itself'. Illustrative figures, a comprehensive bibliography and appendices are also included. This book will be of value to anyone with an interest in the writings of Walbank and the Hellenistic period.