Who was the first Roman emperor to invade Britain? Caesar or Nero?
http://www.britainexpress.com/History/Roman_invasion.htm
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The first Roman Emperor to invade Britain was Julius Caesar. To get this answer, we can refer to historical records and accounts.
Julius Caesar's invasion of Britain took place in 55 BC and then again in 54 BC. Although he was not an emperor at the time, he played a significant role in laying the groundwork for the Roman conquest of Britain. Caesar's invasions were limited in scope and did not result in a full-scale Roman occupation of the island.
On the other hand, Nero became the Roman Emperor much later, in 54 AD, after the death of his predecessor Claudius. Nero did not personally lead any military expeditions to Britain during his reign.
Therefore, the correct answer to the question is Julius Caesar, not Nero.