While this isn't a book, the movie "Mongol", all about Khan's life, is excellent.
Just watched it the other day. Excellent is not a word I would use to describe it. Mildly interesting because it deals with someone I've just been reading about(from going to choose a wife up until uniting all the tribes), but as a movie it's horribly made. It just bounces around randomly as fuck. One minute he's a kid, then he's found by someone random and they decide they're blood brothers, then he's grown, then he goes to get his wife, then he's got a tribe, then he doesn't, then he's got more tribes, then he's captured, then he's got half the nation.
No transition, that's just like scene to scene. Straight cut from each situation to the next, no explaining how any of it got that way.
That said, it did introduce that
Jamukhaperson to me, who I can not believe was just not in the books in any form. Basically Genghis' biggest bro, ended up being his main rival for control of the Mongols. Half the steppe tribes united behind him and not Genghis, but they eventually lost(after defeating Genghis multiple times) because he let them maintain their tribal allegiances instead of forcing them all to work as one. This wasn't interesting enough for the books??
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I'm through the first of the 5 podcast episodes. It's just 1 dude talking so gets kind of droney, but the info is solid and he keeps it interesting and avoids making it in to some dry recitation of history. And I love the opening point about how historians/people tend to ascribe positive motivations to these great historical conquerors(Alexander etc) that were really unintended side effects of the horrible atrocities they committed. "They're shooting the arrow and then painting a bullseye around where it hits". Genghis wasn't trying to spread freedom of religion and make safe trade routs, he was murdering millions for loot. That other shit just came happened=P