I have never seen Game of Thrones.
I've seen it a few times. It's an adaptation of a George R R Maratin novel series called A Son;g of Ice and Fire
I had not heard of the series. 
It's on HBO and was created for television by David Benioff and D B Weiss
Is there a TV series too then?
Yeah, it premiered on HBO in the United States in 2011 and it's 7th season ended in 2017
Maybe I will have to check it out.
It's extremely popular, that's for sure. The eighth season won't be on until 2019, next year.