The Roman Empire was one of the greatest and most influential forces of the ancient world, and many of its achievements endure in one form or another to this day. Because of its geographic breadth, cultural diversity, and overall complexity, it is also one of the most difficult organizations to understand. This book focuses on the Roman Empire from the time of Julius Caesar to the sack of Rome. While most references on the Roman world provide a series of alphabetically arranged entries, this work is organized in broad topical chapters on government and politics, administration, individuals, groups and organizations, places, events, military developments, and objects and artifacts. Each section provides 20 to 30 substantive entries along with an overview essay. The work also provides a selection of primary source documents and closes with a bibliography of important print and electronic resources.