I just caught up with Kingdom the other day and now I really want to read something on that is like Kingdom or Shoukoku no Altair. I really enjoy the maneuverings of the characters and its effects so anything like those two, or like Historie, would be awesome.
Vinland Saga - Depicting (among other things) rise of Knut the Great to the throne and his political life. Date Masamune - Biography of Date Masamune. Various political struggles for power. Alexandros - Alexandros rise to power, his reign and goals of The Diadochi.