2000 years ago this was a frontier, a place where two cultures collided. Your guide can happily weave a narrative from both the Roman perspective and the native perspective, providing both viewpoints.
The Romans always intended to conquer Britain. Julius Caesar wrote about the riches of the British Isles... and also of giants and monsters. While Caesar made initial contact with the peoples of Britain, a full scale invasion would take another 90 years. Political turmoil in Rome was the catalyst for the new emperor, Claudius to bring his forces to the shores of Britain, changing the country forever.
