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 strange city is ruled by a sorceror lord claiming to be the 69th yellow emperor of Yi Ti.
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.