"Well, I've never heard of any of them, so it's less weird than Stalas. And he's a prince, and Ambrose is going to be King of Ferelden - oh, that's right, I haven't explained nobility yet, have I..."
Vocabulary lesson! Kings and queens are hereditary rulers of countries. Princes and princesses are their children. In Ferelden there are also three different ranks of nobility, who rule subsections of the country, administering to their own lands and then answering in turn to the king: a teyrn rules a teyrnir, which is very big; an arl rules an arling, which is of medium size; a bann rules a bannorn, which is relatively small. Ambrose's friend Eamon who they are trying to save from being poisoned is in fact the Arl of Redcliffe, which is why it's so important to save him, because he has political influence which he can use to help them save the world from the Blight but only if he is alive to do so.