What kind of document is the Histories by Polybius?

The Histories by Polybius is a historical document. It is a comprehensive account of the events that shaped the Mediterranean world from 264 BC to 146 BC. Polybius was a Greek historian who wrote extensively about the rise of the Roman Empire, as well as the political and military developments of his time. The Histories is considered one of the most important historical documents of ancient Greece, as it provides valuable insights into the political and social structures of the time.