George R.R. Martin is an American author that has created, what is for me, one of the best worlds of genre fiction since that of Tolkien, surpassing him in many ways.
His epic series a Song of Ice and Fire
is modeled loosely along that of historical events from the War of Roses in England. You have a group of families all vying for power and feudal authority over one another and the high throne. What really sets this particular work above others is the way the story is told.
Each chapter is told from a POV (Point of View) perspective. So you may have the first chapter told from the point of view of one of the Kings, another from his bastard son, another from an enemy and the story unfolds in this way. While there are some fantastical elements to this series, it is not the focus of the series. There is plenty but it does not hit you in the face.
The series is built around the characters and their interactions. While there are some dragons, a few "other" ice like beings, there is quite a bit of reality from the time period that is addressed. Themes like regicide, fratricide, rape, incest, murder, deception, all events that occurred during that time period.
Another issue that I particularly enjoy in this series is that character that may seem to be protagonists are not protected from the events of the story line. There is no guarantee that the main character of a book will survive. George is not above killing off what you would assume to be a major character in chapter 4 or 5.
The listings of families, their heraldic symbols, the back stories and detailed chronicles of their ancestry all help establish this series in the real world.
, is worth checking out. A lot of information about that time period can be gleaned from this series, heraldry, military warfare history, etc.