I'm sorry, but Game of Thrones is entirely a work of fiction and does not correspond to anything in history beyond the loosely medieval setting. Perhaps this is a more appropriate question for the GoT experts at /r/asoiaf.

Game of Thrones is a narrative version of a Renaissance Faire. It's a lot of fun and it looks kind of like what people imagine the past to be like, and that's because it's a pretty good recreation of what people would imagine the past to be like. Which is to say: there are no historically redeemable aspects of the show or books.

GRRM has said that the story is loosely based on the War of the Roses, and there are a couple of things "based on historical events". The Red Wedding has a parallel in 15th century Scotland, for example. However, there is nothing 100% accurate, and the similarities are only superficial. Yes, a lot of people died in the War of the Roses. No, not that many people. Yes, politics were backstabby. No, not that backstabby. Yes, people used swords. No, neither their swords nor armor looked like that.

Do you go to King Arthur's Faire expecting to learn about history? (Please say no) This is no different.