1) Apocalypse quartet 2) Apocalyptic figures 3) Apocalyptic quartet 4) Biblical quartet 5) Dreaded quartet 6) Equestrians 7) Four of Revelation 8) Jockeys 9) Noted foursome 10) Revelation foursome 11) Steed riders 12) Trainers, jockeys et al 13) Trainers, jockeys, and others 
• (pl. ) of Horseman