the imaginary capital of the Realm of the Dolls (le royaume des poupées) in Alexandre Dumas's translation of E. T. A. Hoffmann's Nussknacker und Mausekönig (The Nutcracker and the Mouse King)
Confederacy (group of U.S. states that seceded from the Union during the American Civil War); Confederation (union of provinces and territories of British North America to form Canada); ellipsis of Confédération suisse (“Swiss Confederation”)
Democratic Republic of the Congo (a country in Central Africa, larger and to the east of the Republic of the Congo); Republic of the Congo (a country in Central Africa, smaller and to the west of the Democratic Republic of the Congo)
Constantinople (the former name, from 330–1930 C.E., of Istanbul, the largest city in Turkey; the former capital of the Ottoman Empire and of the Byzantine Empire before that)
Cordoban, Cordovan (native or inhabitant of the city of Córdoba, capital of the province of Cordoba, Andalusia, Spain) (usually male); Cordoban, Cordovan (native or inhabitant of the province of Cordoba, Andalusia, Spain) (usually male)