The Collaborative International Dictionary of English v.0.48:

Discrown \Dis*crown"\, v. t. [imp. & p. p. Discrowned; p. pr.
   & vb. n. Discrowning.]
   To deprive of a crown.
   [1913 Webster]

         The end had crowned the work; it not unreasonably
         discrowned the workman.                  --Motley.
   [1913 Webster]