To trace ancient civilizations, naturally, one cannot focus on comfortable libraries, research institutes, universities, and museums, but rather on field trips to the locations of these historical sites.
For example, the Mycenae ruins that Leonard is looking for this time are just like that, so after leaving Athens city center, they quickly drove westward to the cradle of early Greek civilization on the Peloponnese Peninsula.
The Mycenaean civilization is a very ancient and wild civilization, 1000 years earlier than the Ancient Greece known today, and it also values military power much more than them.
The earliest impression of this civilization comes from the ancient "Homer's Epic". According to the story, they once launched a ten-year-long expedition across the sea in pursuit of Helen.