The Count of Boulogne is a historical title in the kingdom of France. The city of Boulogne-sur-Mer became the center of the county of Boulogne during the ninth century. Little is known of the early counts, but the first held the title during the 11th century. Boulogne was attacked and besieged a number of times during the Hundred Years' War, repeatedly passing between the English and French. In 1477 Bertrand VI of La Tour gave the county to Louis XI, who incorporated the county into France. Boulogne remained part of France, except for a brief period of English rule under Henry VIII.