Im looking for a biography ?? 5 points :DD?

I wana start reading a biography of a great person who influenced the history such as Napoleon or Da vinci or even hitler ( if i had to ) ...... THey are persons who affected our world for years to come i wana read it to grasp how a smart person Like Da vinci though or how to think politicaly and global wise such as hitler or napoleon........ Summary : i want a story of a global person who affected world which can teach me a smarter way of thinking and historical information that a person should know as baises