Actually the British took away consent for royals to rule vis the Magna Carta and so on. So maybe not a great example. Today the king has only the right to be

Actually the British took away consent for royals to rule vis the Magna Carta and so on. So maybe not a great example. Today the king has only the right to be told, and the right to be heard. Parliament does the rest (i.e. laws and rules). Further, it's fair to say that legitimacy has a lot of interpretations. If it's 'they are legitimate because they have power' then the definition is circular.