Yea, Vagabound is really awesome so far, you can find it at Mangatraders OR manga-sketchbook.org . I really recommend Shin Angyo Onshi scanlated by ~Etc (http://et-caetera.net) though (but thats just my bias). Both mangas have like a page or two at the end of each volume that relates the characters and events to actual history and gives a better understanding of what happened.

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