Carcosa is a legendary city in far eastern Essos. It is located on the southeastern shore of the Hidden Sea within the Mountains of the Morn; the City of the Winged Men is situated on the northwestern shore. The sorceror lord claiming to be the 69th yellow emperor of Yi Ti lives in exile at Carcosa.
Behind the scenes
Carcosa and its yellow emperor are references by George R. R. Martin to Carcosa, a city in "An Inhabitant of Carcosa" by Ambrose Bierce, The King in Yellow by Robert W. Chambers, and the Cthulhu Mythos of H. P. Lovecraft.