The Collaborative International Dictionary of English v.0.48:

Favorer \Fa"vor*er\, n.
   One who favors; one who regards with kindness or friendship;
   a well-wisher; one who assists or promotes success or
   prosperity. [Written also favourer.]
   [1913 Webster]

         And come to us as favorers, not as foes. --Shak.
   [1913 Webster]