The city is first recorded in 58 BC as Vesontio in the Book I of Julius Caesar's Commentarii de Bello Gallico. The etymology of Vesontio is uncertain. The most common explanation is that the name is of Celtic origin, derivated from wes, meaning 'mountain'. During the 4th century, the letter B took the place of the V, and the city name changed to Besontio or Bisontion and then underwent several transformation to become Besançon in 1243.

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