[ she smiles at that, though it's far from being a happy smile — she smiles because she knows exactly what that sounds like. using the Gods, for one purpose or another. praying for the Gods for good fortune, and watching everyone die. ]

No right other than the right by conquest. Because they were stronger than anyone else. When the Targaryens conquered the Seven Kingdoms, they did so with their dragons, burning everyone who resisted them. When the Mad King started to burn his subjects, Robert Baratheon gathered an army and defeated the Targaryen loyalists. The right to rule is yours only until someone stronger comes along.