The Collaborative International Dictionary of English v.0.48:

Principle \Prin"ci*ple\, v. t. [imp. & p. p. Principled; p.
   pr. & vb. n. Principling.]
   To equip with principles; to establish, or fix, in certain
   principles; to impress with any tenet, or rule of conduct,
   good or ill.
   [1913 Webster]

         Governors should be well principled.     --L'Estrange.
   [1913 Webster]

         Let an enthusiast be principled that he or his teacher
         is inspired.                             --Locke.
   [1913 Webster] Princock

WordNet (r) 3.0 (2006):

principled
    adj 1: based on or manifesting objectively defined standards of
           rightness or morality; "principled pragmatism and
           unprincipled expediency"; "a principled person" [ant:
           unprincipled]