Board Thread:Skyrim/@comment-108.163.127.221-20160128201342/@comment-6881629-20160128203001

Maybe they all know it but Morokei was the only one to actually use it, as he was the only one who seemed to want a conversation (everyone else from the time of the Dragon War seems to speaks it). Or he somehow learns it from the two members of Savos Aren's expedition sealed with him.