Historie is a great manga based on well, actual history and more precisely on the life of Eumenes a great greek general and scholar, and it does a good job of showing us the different aspects that shaped him, it may not be 100% accurate since it is a manga and of course the writer added some things but it stays pretty true to the actual story.
The art is not that great, but it is good, decent amount of detail, there is room for improvement but it is doing its job well enough,
The characters are where the manga shines though ( at least for me ), especially Eumenes himself, he isn't one dimensional, he's not a blood thirsty killer but he is not afraid to kill either, he will do it if need be, he's a scholar and likes to read a lot but he is also a good fighter, he isn't just one thing. He uses his head in battle and is a great tactician, it's really hard not to like his character, he's smart, loyal, a strong leader with a strong character.
The other characters including a lot of other famous people from that time like Aristotel, Philip II of Macedon, Alexander the Great, etc. are all well done, however I think some of them could have been used more but hey, there is still a lot of time, basically the manga is just really beginning and it really is starting to build up to something great.
The manga has some action, though not that much yet, but it is a great historical adventure, with some action, tactics, and really overall a much smarter read then most manga out there, it's definitely worth a read if you're interested in any of the above mentioned.