Anyone knows what the Theran flag or "official" symbol looks like?

What would be a Theran merchant caravan/expedition?

My plan is to have the players arrive at a village/kaer where the Therans are trying to negotiate some sweet deals with the skeptical local elves (loyal to the Wyrm Wood so far, haven't heard anything about the Blood Wood yet). the players come from a newly opened kaer, this is their first contact with foreigners and know shit about the Therans. The latter might be thrilled to know about their village's location, especially if they can later make a big slave raid (aka, "your GM thinks it's time to go explore the world").