So i did a bit of digging for Harmony's discourse and i think the strongest lead is Harmonia, daughter of Ares and Aphrodite or Zeus and Electra (no one can decide). Harmonia was actually the God of 'love that unites all people, the personification of order and civic unity'... which is basically what discourse means!!
Also, I've just thought about something. Could we be looking at this wrong? Instead of trying to map out the constellations randomly, what if we tried to sort the material into categories (Greek myths, Nature, people etc?) and see if that brings us to anything! What do people think?
Update: She wasn't the god of those things, she was closely associated with Aphrodite Pandemos who was. Sorry guys! Guess it still counts though right?