The Grey God Passes

"The Twilight of the Grey Gods", also known as "The Grey God Passes", is a short story by American writer Robert E. Howard that blends history and fantasy. Published posthumously in 1962, the first appearance of the story was in a collection titled Dark Mind, Dark Heart, edited by August Derleth. The tale is a fictionalized version of the Battle of Clontarf (1014) recast in Howard's views, with doomful visions and weird fantasy elements. While the historical facts of the battle are accurate, they are not the most important parts of the story. The protagonist is Conn the Thrall, who fights alongside Turlogh Dubh O'Brien, a recurring character of Howard's who is an outcast from Brian Boru's clan.