A Game of Thrones is a total conversion mod for Crusader Kings II, based on George R. R. Martin’s fantasy novel series, A Song of Ice and Fire.
Beside A clash of Kings mod for Warband this is probably the second best Game of Thrones mod out there. One of the most fantastic features is the "What if". What if Jon accepts Stannis hel and becomes King in the North? But sadly this is getting boring after a time of playing.