The Counts of Dreux were a noble family of France, who took their title from the chief stronghold of their domain, the château of Dreux, which lies near the boundary between Normandy and the Île-de-France. They are notable for inheriting the Duchy of Brittany through Pierre de Dreux's marriage to Alix de Thouars in the early 13th century.
In the tenth century the lands belonged to the forebears of the Capetians; they passed by marriage to Walter, Count of the Vexin, then to Richard I of Normandy. In 1017 the lands were given as dowry to Richard's illegitimate daughter Matilda, who married Odo II, Count of Blois.
King Robert II of France confiscated the lands of Dreux from Odo, and they formed part of the royal domain until Louis the Fat granted the county of Dreux as an appanage to his son Robert. The descendants of Robert held the county of Dreux until 1355, when the heiress, Countess Joan II of Dreux, married Simon de Thouars. Simon and Joan had three daughters and no sons; their daughters sold their interests in the county of Dreux to King Charles VI.
Dreux (French pronunciation: [dʁø]) is a commune in the Eure-et-Loir department in northern France.
Dreux 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.