"Men of the Shadows" is the title of a poem by American writer Robert E. Howard, published sometimes in itself and sometimes at the beginning of a 1926 story with the same title, dealing with the Pictish King Bran Mak Morn.
The story was included in Bran Mak Morn, Dell Books (1969), and in Worms of the Earth, Ace Books (1979).
The poem introduces Howard's idea of the "five great sub-races": Picts, Lemurians, Atanteans, Celts, and Aryans.
"[T]he building blocks for nearly all of Robert's fantasy stories... are laid out... to mix and match.
"[1] Men of the Shadows consists of several very loosely connected elements.