100. See a law of Constantine himself. A praefectis autem
praetorio provocare, non sinimus. Cod. Justinian. l. vii.
tit. lxii. Ieg. 19. Charisius, a lawyer of the time of
Constantine (Heinec. Hist. Juris Romani, p. 349), who admits
this law as a fundamental principle of jurisprudence,
compares the Praetorian praefects to the masters of the
horse of the ancient dictators. Pandect. l. i. tit. xi.