Topic: Tell me a short, interesting fact about

One fascinating fact about the Roman Empire is that the Roman army initially used a rudimentary, yet highly effective naval weapon known as the "greek fire." Invented by the Byzantine Empire around the 7th century, this incendiary liquid could be launched from ships to set enemy vessels on fire, making it difficult for them to approach or flee. It was a significant advantage in naval warfare until its formula was lost after the fall of the Byzantine Empire. However, the Roman Empire adopted it during its later years and used it successfully on several occasions to protect their own fleets and conquer enemies by sea.