Topic: Tell me a short, interesting fact about

Here's an interesting fact: The Roman Empire was the largest empire in the ancient world and one of the longest-surviving political and cultural units in history. At its height under Emperor Trajan (98-117 AD), it incorporated more than 60 provinces and territories spanning three continents — Europe, Africa, and Asia — and included a land area of about 5 million square kilometers, covering an estimated 25% to 30% of the world's population. It was especially known for its great advancements in law, engineering, architecture, technology, art, and language.