The Collaborative International Dictionary of English v.0.48:

Scepter \Scep"ter\, Sceptre \Scep"tre\, v. t. [imp. & p. p.
   Scepteredor Sceptred (?); p. pr. & vb. n. Scepteringor
   Sceptring.]
   To endow with the scepter, or emblem of authority; to invest
   with royal authority.
   [1913 Webster]

         To Britain's queen the sceptered suppliant bends.
                                                  --Tickell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sceptred
    adj 1: invested with legal power or official authority
           especially as symbolized by having a scepter [syn:
           empowered, sceptered, sceptred]