1. red, as a heraldic tincture:"sword and long cross gules"
Word OriginMiddle English: from Old French goles (plural of gole ‘throat’, from Latin gula), used to denote pieces of red-dyed fur used as a neck ornament.
In heraldry, gules is the tincture with the colour red. It is one of the class of five dark tinctures called "colours", the others being azure (blue), sable (black), vert (green) and purpure (purple). Wikipedia