I finished watching the 3rd season of GoT recently. The serial is really great. But I suddenly recalled reading long ago a series of books called The Accursed Kings by Maurice Druon. And I see a lot of parallels.
Now, The Accursed Kings tells us a story about the French kingdom in XIV century, and the battle for the throne between several branches of the ruling dinasty. The principle "Everybody dies", which GoT is famous for, perfectly fits for AkK:
The Iron King, the main hero of the first book, dies at the end of the first book.
Also, there is an adultery line
The wives of two king sons cheat on their husbands, which lead to the fight for who should actually claim the the throne after Iron King is gone.
Also, the english queen cheats on her husband and takes part in murder of Edward the II.
The main difference is, as I see it, the presence of fantasy in GoT. But, without it, the two series have a very close style.
So, why is that? Was George Martin officially inspired by Druon books, or it was just because they both took inspiration in medieval history?