had to be replaced for medical reasons. Author George R. R. Martin wrote on the casting of Conleth Hill as spymaster Varys: "Hill, like Varys, is quite a chameleon, an actor who truly disappears inside the characters he portrays, more than capable not only of bringing the slimy, simpering eunuch to life." Ian McElhinney plays Ser Barristan Selmy, the commander of the Kingsguard, and Miltos Yorelemou appears as the fencing instructor Syrio Forel. McElhinney had previously played Gillen's father in Queer as Folk. The hierarchy of the Wall is introduced with James Cosmo as commander Jeor Mormont, Peter Vaughan as the blind maester Aemon, Owen Teale as the trainer of the new recruits Ser Alliser Thorne, and Francis Magee as the recruiter Yoren. This episode also marks the first appearance of the Welsh actress Margaret John as Old Nan. 84-year-old Margaret John died on 2 February 2011, a few months after having finished recording her scenes in Game of Thrones, which was her last role on television. Executive producers David Benioff and Dan Weiss issued a statement grieving her death. The episode "Lord Snow" is dedicated to her, with the last credit being "In the memory of Margaret John." Filming locations To film the scenes at the Wall the production built a set on the abandoned quarry of Magheramorne, a few minutes north of Belfast. The composite set (with both exteriors and interiors) consisted of a large section of Castle Black including the courtyard, the ravenry, the mess hall and the barracks, and used the stone wall of the quarry as the basis for the ice wall that protects Westeros from the dangers that dwell beyond. They also made a real elevator to lift the rangers to the top of the Wall. For the streets of King's Landing, the production flew to Malta. The gate of Fort Ricasoli doubled as the King's Gate, shown at the beginning of the episode when the royal entourage enters the city. The entrance of the Red Keep used when Catelyn and Rodrik enter the fortification corresponds to Mdina Gate, and also in Mdina the Pjazza Mesquita is the location for the entrance to the brothel owned by Lord Baelish. Ron Donachie, the actor playing Ser Rodrik Cassel, said that the scene where he entered King's Landing was his favourite moment. Visiting a museum in the Maltese capital of Valletta, Donachie had seen a painting