Jus civitatis
JUS CIVITATIS. Among the Romans the collection of laws which are to be observed among all the members of a nation were so called. It is opposed to jus gentium, which is the law which regulates the affairs of nations among themselves. 2 Lepage, El. du Dr. ch. 5, page l.
A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.