It has been an undergraduate essay topic for the last 50 years and is a question that continues to challenge archaeologists studying the history of Roman Britain: what exactly is a villa, and is there even a simple definition that fits them all? The Association for Roman Archaeology recently brought together 20 experts to consider new discoveries, new interpretations, and the role of the villa in Romano-British culture, religion, and landscape. Their conclusions have just been published, as Chris Catling reports.