The Collaborative International Dictionary of English v.0.48:

Portague \Por"ta*gue\, n. [See Portuguese.]
   A Portuguese gold coin formerly current, and variously
   estimated to be worth from three and one half to four and one
   half pounds sterling. [Obs.] [Written also portegue and
   portigue.]
   [1913 Webster]

         Ten thousand portagues, besides great pearls.
                                                  --Marlowe.
   [1913 Webster]