The Collaborative International Dictionary of English v.0.48:

Jongleur \Jon"gleur\, Jongler \Jon"gler\, n. [F. jongleur. See
   Juggler.]
   [1913 Webster]
   1. In the Middle Ages, a court attendant or other person who,
      for hire, recited or sang verses, usually of his own
      composition. See Troubadour.
      [1913 Webster]

            Vivacity and picturesquenees of the jongleur's
            verse.                                --J R. Green.
      [1913 Webster]

   2. A juggler; a conjuror. See Juggler. --Milton. Jonquil

WordNet (r) 3.0 (2006):

jongleur
    n 1: a singer of folk songs [syn: folk singer, jongleur,
         minstrel, poet-singer, troubadour]