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The Chalgrove II Hoard
This hoard of Roman coins was found by metal detectorist Brian Malin in Oxfordshire in 2003. He took the pot full of corroded coins to specialists at the British Museum, who then very carefully began to clean and separate the coins. It was only after they had extracted the roughly 5000 pieces that they realized they had found one very intriguing specimen—a coin featuring the head of the virtually unknown Roman emperor Domitianus.

Another coin featuring Domitianus had been found in France a century earlier, but because historians weren’t aware of the emperor, the find was dismissed as a hoax. The discovery of the second coin confirmed that the French coin was legit. The extreme rarity of the piece and the scant written references to this “lost” emperor suggest that he may have held the title only for a short time during a period of crisis in the Roman Empire.
gpt
A man named Brian Malin found a large pot full of coins in a town in England in 2003 using a metal detector. He took the coins to people who study coins at the British Museum. They had to carefully clean and separate the coins because the metal coins were dirty and had begun to stick together. There were about 5,000 coins. When looking at each coin, they realized they had one very unusual coin. The coin showed the face of a person named Domitianus. Another coin had been found in France many years ago with the same person on it, but since historians didn't recognize the person, they thought the coin was fake. Now they realized that this meant the coin found in France was real. They also realized that the person pictured on the coin was a Roman emperor who was emperor for such a short time that there isn't very much information about him. 