The Collaborative International Dictionary of English v.0.48:

Wildgrave \Wild"grave`\, n. [G. wildgraf or D. wildgraaf. See
   Wild, and cf. Margrave.]
   A waldgrave, or head forest keeper. See Waldgrave.
   [1913 Webster]

         The wildgrave winds his bugle horn.      --Sir W.
                                                  Scott.
   [1913 Webster]