Game of Thrones reference in One piece I can't find which episode it was but in "Impel down" I feel like I saw the same throne we can see on the TV show Game of Thrones, is it related or not or maybe just a coincidence ?
The chapter 525 titled "The Underwater Prison Impel Down" which started the arc out got released on 8th of December 2008. The first episode of the Game of Thrones TV series aired in 2011, so there's no chance it could reference anything from it.