The county of Lens with the capital Lens was held in the 11th century by Lambert von Boulogne († 1054), then by his brother Eustach II , Count of Boulogne.
The castellan of Lens was also Vogt of Saint-Pierre in Ghent from the 11th century .
In 1160 it came under the sovereignty of the county of Flanders , and in 1192 went with the Artois to the King of France .
Earls of Lens
Lambert , † 1054
Eustach II , † 1070/82, Count of Boulogne, 1054 Count of Lens, his brother
Eustach III. , † after 1125, Count of Boulogne and Lens, his son
Mathilda of Boulogne , † 1151, Countess of Boulogne and Lens