Another member from the "Game of Thrones" crew is rumored to make its appearance in the sixth season.
Bryden Tully or Blackfish (Clive Russell) is rumored to return after his departure from season 3, according to Los Siete Reinos, and his presence in Northern Ireland strengthens the rumors.
Tully, is Catelyn Stark's uncle and was last seen in the episode "The Rains of Castamere" in Season 3. He left The Twins prior to Red Wedding, which resulted in murder of Catelyn Stark and Robb Stark.
The scenes, which are currently being filmed for the siege of Riverrun, and Tully's confrontations with Lannister are following the original plot, IGN reported.
According to "A Feast of Crows," which is Martin's fourth book, the Siege of Riverrun has a big storyline, and it was speculated that this would not be featured on the TV series since Season 5 deviated from the story.
Viewers can recall that in Season 3, instead of storming Riverrun, Jaime went to get Myrcella in Dorne while it is unknown if the character survived or not.
Additionally, Jerome Flynn, who plays Bronn in the series along with Coster-Waldau, was spotted filming in Norther Ireland, according to Watchers On The Wall.
An assault scene was being filmed in that area, and viewers can expect The Blackfish and Jamie having an argument.
Several pictures of the Riverrun set indicate the presence of a wooden structure and a drawbridge, which is taking shape on the set.
"Game of Thrones" Season 6 is expected to return on April 2016.