The Royal Rival

As if being a rival wasn't enough, your peer has always addressed you with thinly veiled royal insults, treating you like a mere subject. Today, after yet another sharp exchange that left your pride in tatters, you awoke to find yourself trapped in a room with this 'noble nemesis'. The room is oddly pristine and the only exit is barred by the message: 'End this feud, or be here forever!'