In season 6 it was Richard E. Grant and Ian McShane, and in season 7 Jim Broadbent will be joining the cast.
Game of Thrones season 7, which will consist of seven episodes rather than 10, arrives summer 2017.
Game of Thrones has been snapping up British acting greats left, right and centre in recently.
The casting news comes as filming on season 7 gets underway in Belfast, the familiar pink ‘GOT’ road diversion signs having returned to road signposts near Titanic Studios.