Rome

Roman discipline was built upon a belief in the virtues of austerity and frugality, the dignity of labor and an acceptance of hardship – but tempered by a willingness to acknowledge the basic humanity of soldiers and not to castigate them for sins they committed away from the battlefield.

"To robbery, slaughter, plunder, they give the lying name of empire; they make a solitude and call it peace." -Calgacus, Chieftan of the Caledonian Confederacy