Details of the Oscar winner's character are being kept under wraps, but his character is reportedly "significant", according to Entertainment Weekly.

The penultimate seven-episode season of the hit fantasy drama is slated to premiere next summer (17).

With his casting, Broadbent is the latest member of Harry Potter's wizarding world to take up residency in Westeros - franchise alum David Bradley, Natalia Tena, and Ciaran Hinds have all featured on Game of Thrones over the past six seasons. Broadbent played Professor Horace Slughorn in the Harry Potter films.

And he's not the only veteran British thespian on the show - Dame Diana Rigg, Peter Dinklage, Charles Dance, Jonathan Price, Liam Cunningham, and Stephen Dillane have all appeared on the cult programme.