Emilia Clarke Says Iain Glen Is 'a Friend for Life' After His Game of Thrones Character Tragically Dies

As most Game of Thrones fans know by now, last night’s episode, “The Long Night,” was a doozy.

Star Emilia Clarke posted a tribute on Instagram Monday to one of the episode’s major casualties, celebrating her love for her fallen costar Iain Glen’s character Ser Jorah Mormont, who was killed while defending Clarke’s Daenerys in the epic Battle of Winterfell.

Clarke, 32, recently told PEOPLE that she developed an almost instant friendship with and appreciation for Glen after he helped comfort her during a mishap on her very first day of filming Thrones nearly 10 years ago.

“The first day on set I fell off my horse and cried,” she recalled. “I have the most visceral memory of the first day, it is Iain Glen calming the horse, calming me, and I was like: ‘That is my friend for life.’ ”