Your premise keeps changing. First it was inspired by got but not the books then it was like got but not specifically now its back to the TV show. An inability to pitch your campaign idea without resorting to the equivalent of Calvin ball is a severe failing as a gm.... also by the way, mRton used real world events to heavily provide structure of certain things for got such as the war of the Roses the black dinner the mongol empire and so on. If you wanted to run a game set in historic England where there were no elves and nothing elf like you should pitch that instead of game of thrones... good luck learning from your inexperience and doing better in the futureWell in the context of the show, Players #1, #2, and #3 definitely chose concepts that aligned with the characters that featured in the main storylines. GoT, the TV show, is not at all about the peasants, it's about the Knights and Nobles, at least the show I watched was.
Sorry that you don't like how I handled the situation but Player #4 was unwilling to buy into the premise. Players #1, #2, and #3 were on board from the get go. So I as GM should, what, kill the campaign to make Player #4 happy? If that were the case, then all four players would have to find new games as I have zero interest in running the kitchen sink fantasy Player #4 was looking for. As GM I am only interested in running games I am interested in and will not be forced to run a game I have no interest in running. Being GM is not a job, I don't get paid to do it, I do it for fun. I don't have fun running kitchen sink murderhobo fantasy adventure games. I haven't had fun running those games in decades. I won't ever run a kitchen sink murderhobo fantasy adventure game ever again. Lucky for me there are lots of players that are willing to play the kinds of games I want to run.

BBC Radio 4 - Radio 4 in Four - The real historical events that inspired Game of Thrones
True historical incidents and characters that helped inspire George R. R. Martin.