Jörg Knappen wrote on Sat, Jan 21, 2012 08:48 AM UTC:
As far as I can see, the name 'vicount' (without an s) is indeed Peter Aronson's invention. The piece itself is absent from Derzhanski's list ( http://www.chessvariants.org/piececlopedia.dir/whos-who-on-8x8.html ) and from Töws' Generic chess piiece creation system ( http://www.chessvariants.org/unequal.dir/genericchesssystem.html ). I recommend a look into the latter for some other names for rarely used pieces like Boxer (Commoner + Beaver) or Foursquare (FNLJG in Betza notation, L is Camel, J is Antelope, and G is Tripper).
Derzhanski's list also gives sources to games, Töws obviously draws from similar sources, but does not give them.