text: Dijon holds an International and Gastronomic Fair every year in the northern-hemisphere autumn. Dijon also hosts every three years the international flower show Florissimo. Dijon has become famous for Dijon mustard, which originated in 1856, when Jean Naigeon of Dijon substituted verjuice, the acidic "green" juice of not-quite-ripe grapes, for vinegar in the traditional mustard recipe. Dijon is a green city with an important tertiary sector, as well as a regional economic center with a diversified fabric, a traditional food-processing center (Dijon crême de cassis and kir, gingerbread, Lanvin chocolate...) and a renowned pharmaceutical sector.
  On 4 July 2015, UNESCO registered the historical centre of the city as a World Heritage site, as one of the components of the "Climats, terroirs of Burgundy" site, because of its historical importance in regulating the system of wine production in Burgundy.
  History
  The earliest archaeological finds within the city limits of Dijon date to the Neolithic period. Dijon later became a Roman settlement called Divio, which may mean sacred fountain, located on the road from Lyon to Paris. Saint Benignus, the city's apocryphal patron saint, is said to have introduced Christianity to the area before being martyred.
  This province was home to the Dukes of Burgundy from the early 11th until the late 15th century, and Dijon was a place of tremendous wealth and power and one of the great European centres of art, learning, and science. The Duchy of Burgundy was key in the transformation of medieval times toward early modern Europe. The Palace of the Dukes of Burgundy now houses the city hall and a museum of art.