The Collaborative International Dictionary of English v.0.48:

Yourself \Your*self"\, pron.; pl. Yourselves. [Your + self.]
   An emphasized or reflexive form of the pronoun of the second
   person; -- used as a subject commonly with you; as, you
   yourself shall see it; also, alone in the predicate, either
   in the nominative or objective case; as, you have injured
   yourself.
   [1913 Webster]

         Of which right now ye han yourselve heard. --Chaucer.
   [1913 Webster]

         If yourselves are old, make it your cause. --Shak.
   [1913 Webster]

         Why should you be so cruel to yourself ? --Milton.
   [1913 Webster]

         The religious movement which you yourself, as well as
         I, so faithfully followed from first to last. --J. H.
                                                  Newman.
   [1913 Webster]