"I was offered something on 'Game of Thrones' and unfortunately, I hadn't seen it, but my nephew and his father said, gosh, 'Game of Thrones' is the only great show on! And I felt terrible, because I'd just turned them down," Dominic West told HuffPost back in 2012.
While West couldn't remember the exact name of the character, he said it was a prominent role on season three and would've involved filming on location "in Reykjavik for six months," which is where "Game of Thrones" typically shot scenes north of the Wall.
Given this information, it's most likely West was offered the role of Mance Rayder, the King Beyond the Wall, which eventually went to Ciarán Hinds.
"It was a lovely part, a good part. I'm going to regret it," he said. "My problem is, I've got four kids, and at the moment, I'm reluctant to be away from home for a long time."