Justinian 1 is a Byzantine emperor. His reign was wrought with wars because of his desire to regain the western part of the Roman Empire.He could be considered a hero because he wanted to liberate areas that persecuted Catholics. He also helped with establishing a government in North Africa.
How to gain and maintain power
It depends on what section is being mentioned.
I do believe the answer for this is population control but i may be incorrect. please comment if i am
Richard Henry Pratt really wanted to assimilate Native Americans into Christianity. He wanted to quote on quote "transform Indians into civilized Americans as a form of conversion".