The Collaborative International Dictionary of English v.0.48:

Anarch \An"arch\, n. [Gr. ? without head or chief; 'an priv. + ?
   beginning, the first place, magistracy, government.]
   The author of anarchy; one who excites revolt. --Milton.
   [1913 Webster]

         Imperial anarchs doubling human woes.    --Byron.
   [1913 Webster]