The Collaborative International Dictionary of English v.0.48:

Empery \Em"per*y\, n. [L. imperium, influenced by OF. emperie,
   empire. See Empire.]
   Empire; sovereignty; dominion. [Archaic] --Shak.
   [1913 Webster]

         Struggling for my woman's empery.        --Mrs.
                                                  Browning.
   [1913 Webster]