A. H. J. Greenidge, Roman Public Life
“ Under a judicious prince the Republican constitution was sufficient for its own sphere in perhaps ninety-nine cases out of every hundred; because in the hundredth some pressure was felt from the head of the state, we cannot pronounce the dyarchy to be a fiction. If the control by the Princeps is brutally and unwisely, however legally, asserted, he is by common consent not a Princeps but a tyrant. We must judge the Principate by its best names, by a Nerva, a Trajan, a Marcus Aurelius, an Alexander, a Decius. In the reigns of all these princes the dyarchy is a living thing. ”
