Regum et imperatorum apophthegmata

Plutarch

Plutarch. Moralia, Vol. III. Babbitt, Frank Cole, translator. Cambridge, MA: Harvard University Press; London: William Heinemann Ltd., 1931 (printing).

The kings of the Egyptians, in accordance with a rule of their own, used to require their judges to swear that, even if the king should direct them to decide any case unfairly, they would not do so. [*](Cf. Diodorus, i. 71.)