Legend has it that Hannibal, the Carthaginian leader crossed les Baronnies with his elephants during the Second Punic War (218 - 201 B.C.). Later the area retired Roman soldiers were given land here. After the Roman Empire collapsed in the 3rd century, hundreds of years of invasions by Franks, Lombards, Saracens and marauding bands followed. During this period local fiefs started to fortify villages and consolidate power. In the 11th century the area was part of the Holy Roman Empire. During the Barons of Mévouillon consolidated their power over a large part of les Baronnies, they ruled for roughly 300 years from capital in Buis-les-Baronnies. As a result of a family feud in 1125, the western part of les Baronnies was ruled by a different line of Mévouillons. They called themselves Barons de Montauban, hence the name "les Baronnies" (plural). They established their capital in Nyons. Within a short period of time both had to sell their possessions to the Count of Vienne, nicknamed le Dauphin (the dolphin was his coat of arms), who ceded his territory to the King of France in 1349 to pay his debts.
The period from the 18th century to modern day was marked by economic decline and land flight. Only in the 1980s were the Baronnies "discovered". Tourism started to develop and the area between Vaison-la-Romaine and Nyons started to become very popular with tourists and retirees.
Main economic activity is agriculture and tourism. Nyons is the center of the local olive tree cultivation with numerous oil mills, an olive oil cooperative and an olive tree/olive oil museum. The olives grown in Nyons and les Baronnies have an AOC (Appellation d'Origine Contrôlée) quality label.