A hat that Napoleon Bonaparte wore sold at an auction for $2.1 million. This is a record for a hat. The previous record was $2 million, for a hat that also belonged to Napoleon. Napoleon liked hats. He owned around 120 of them. Experts say the latest record-breaking hat is from the early 1800s.

Napoleon is one of France's most famous people. He became emperor of France in 1804. He lost the Battle of Waterloo to the British in 1815 and was sent to a tiny island in the Atlantic Ocean. He died there six years later, aged 51. The sale of Napoleon's hat comes at the same time as a new movie about him.