
“Between a tyrant and a prince there is this single or chief difference, that the latter obeys the law and rules the people by its dictates, accounting himself as but their servant.”
Est ergo tyranni et principis hæc differentia sola, quod hic legi obtemperat, et ejus arbitrio populum regit, cujus se credit ministrum.
Bk. 4, ch. 1
Policraticus (1159)