The Count of Roussillon was a historical title held by rulers of the region of Roussillon, located in the southeastern part of France. This area has a rich history influenced by various cultures, including the Catalans and Aragonese. The title was significant during the medieval period, especially when Roussillon was part of the Crown of Aragon. In 1659, the region was ceded to France through the Treaty of the Pyrenees, which marked the end of the title's relevance. The Count of Roussillon title is now largely of historical interest, reflecting the region's complex political past and its integration into modern France.