I am writing a book about medieval stuff and ...?

Who would be the adviser to the king. The one who handles all the kings problems. For instance in Game Of Thrones its the Hand of the King. But of course I do not want to use that term considering its made up and I would be plagiarizing if I borrowed it. Is there an actual word for someone in a similar position in the real old world? Otherwise I am going to make up a position also. But it may take some brainstorming as I suck with names. I tried google but no real luck.I am writing a book about medieval stuff and ...?
The senior nobility in a kingdom formed a semi official,semi permanent council that the king would use or ask to advise him.



The senior nobility saw this very much as a right,and if some or all were excluded,they could - and often did - make trouble for the king.Richard Duke of York is good example during the reign of Henry VI in England.
For the most part, real medieval kings didn't load all the responsibilities onto just one councillor, and GRRM's novels show why this would have been dangerous. Powers were more likely to be shared by people like the chancellor, the justiciar, bishops and archbishops, the constable and the marshal, and also the king's close relatives.



For a sense of how it worked in high medieval England, see Baldwin's _The King's Council_. It's quite an old book, but it has the virtue of being online and in English.



http://www.archive.org/stream/kingscounc鈥?/a>I am writing a book about medieval stuff and ...?
I would give up. With your level of knowledge on your subject, and comparing it to a game, I don't think your book will be very successful.
Depends on which country you are talking about. Various kingdoms had various names.I am writing a book about medieval stuff and ...?
In some cultures it was a "Vizier", in others it was a "Chancellor".