I need some information on the life history of Nelson Mandella. 
Specifically related to why he was a great leader.
E.g. Genhis Khan
ENVISION
To stop the Mongol tribes fighting, and to preserve their nomadic
lifestyle. To live off the land. Realize their longstanding dream of
?conquering the World".
ENABLE
The compound bow & short stirrup. The "Yasa" legal code. Merit based
army units of 10, 1000, 10000. Peacetime ?Pony express? links.
EMPOWER
Genghis trusted Locals running conquered cities. He promoted on merit.
He was generous, very loyal, and very frank.
ENERGIZE
He personified strong & clear Mongol values. Genghis always led from
the front. He was charismatic. Either surrender and maintain your way
of life, or be slaughtered?.

Thank you