I don't know, but it was someone who probably thought he could change the world
I think pyrrhus of epirus
The change in breastplates and helmets contribute to decline of the Roman Empire by weakening the the military. It weaken them because the removal of it promote laziness and negligence of training and the such. It also removes the protection against ranged weapons which caused many casualties.
Answer:
Rationality.
Explanation:
The word that best fits this definition is rationality. Rationality allows us to make decisions base on reflection and reasons. They are controlled and meditated actions that have a justification due to our beliefs or reasoning. The result is a behavior that is measured and not irrational.