The Collaborative International Dictionary of English v.0.48:

Disseize \Dis*seize"\, v. t. [imp. & p. p. Disseized; p. pr. &
   vb. n. Disseizing.] [Pref. dis- + seize: cf. F. dessaisir.]
   (Law)
   To deprive of seizin or possession; to dispossess or oust
   wrongfully (one in freehold possession of land); -- followed
   by of; as, to disseize a tenant of his freehold. [Written
   also disseise.]
   [1913 Webster]

         Which savage beasts strive as eagerly to keep and hold
         those golden mines, as the Arimaspians to disseize them
         thereof.                                 --Holland.
   [1913 Webster]