Grignan's Doors of France are one of the highlights of the city

Archeological excavations have shown that the rocks of Grignan have been occupied since the Iron Age, which could explain the hypothesis that the Doors of France in Grignan have been inhabited since the Iron Age. As well as being a former Bronze Age site, there were Roman occupations here between the 5th and 6th centuries AD as evidenced by ancient documents. The historians have noted that a cartulaire (a ledger of the titles of church and monastery property) from the Abbey of Saint-Chaffre in the Haute-Loire, which was established in 1035, contains reference to a mysterious castle called Gradignanum, which dates back to the year 1035. Over the next century, the name steadily evolved to become the castrum Grainan (1105), then Graigna, Grazinam ... We know very little about the birth of the castle or those who built it. The existence of a certain Christophe de Grignan has been established some time around the year 1030, and in 1035, the cartulaire of Saint-Chaffre, speaks of a 'Rostaing du château de Grignan,' Rostagnus de castello Gradignano.