Claim: Fort of Planoise, located in Besançon-Planoise, Eastern France and owned by the City of Besançon (Capital of neither the historic nor cultural region of Franche-Comté), was constructed from 1877–1882.
Evidence: 'Burgundy-Free County', sometimes abbreviated BFC) is a region in Eastern France created by the 2014 territorial reform of French regions, from a merger of Burgundy and Franche-Comté. The merger represents a historic reunification of the Duchy of Burgundy (Duché de Bourgogne) and the Free County of Burgundy (Franche Comté de Bourgogne) that were created by the partition of the Kingdom of Burgundy in the 843 Treaty of Verdun.