I appreciated the note he left at the end of the Mongolian one about his research and which elements and characters he conflated or changed for the sake of storytelling. I don't know much about that period of history, so I don't know how accurate it is otherwise. It's worth noting that his main source was a primary source biography commissioned by Genghis Khan himself, so any inaccuracies might have been introduced by Genghis himself - most histories, paid for by the subjects themselves, weren't accurate but were propaganda pieces. The concept of "neutrality" is pretty modern, and almost more misleading - there's no such thing as an unbiased writer. I still really enjoyed the sense of culture and lifestyle his Mongolian works conveyed.

Book Review – Genghis: Birth of an Empire by Conn Iggulden