The name of rebels is given to all subjects who unjustly take up arms against the ruler of the society, [or the law-ful and constitutional government,] whether their view be to deprive him of the supreme authority or to resist his lawful commands in some particular instance, nnd to impose conditions on him. Vatt. Law Nat bk. 3, t 288
Source: Black's Law Dictionary 2nd Ed (1910)