The Barbarian societies were often more complex, being less well-integrated and uniform than Roman society; Rome was far more interested in integrating conquere

The Barbarian societies were often more complex, being less well-integrated and uniform than Roman society; Rome was far more interested in integrating conquered populations. Trust didn't work well for the Persians or Mongolians (at the leadership level.) I don't know a society that solved that one from my reading, highly religious and superstitious societies in which the ruling families were Gods, such as the Egyptians came closer to a solution. Simplicity of a kind.