Dreux is a commune in the Eure-et-Loir department in northern France.HistoryDreux was known in ancient times as Durocassium, the capital of the Durocasses Celtic tribe. Despite the legend, its name was not related with Druids. The Romans established here a fortified camp known as Castrum Drocas.In the Middle Ages, Dreux was the centre of the County of Dreux. The first count of Dreux was Robert, the son of King Louis the Fat. The first large battle of the French Wars of Religion occurred at Dreux, on 19 December 1562, resulting in a hard-fought victory for the Catholic forces of the duc de Montmorency.