All 3 Uses of

prerogative
in
Utopia, by Thomas More

Another proposes that the judges must be made sure, that they may declare always in favour of the prerogative; that they must be often sent for to court, that the king may hear them argue those points in which he is concerned; since, how unjust soever any of his pretensions may be, yet still some one or other of them, either out of contradiction to others, or the pride of singularity, or to make their court, would find out some pretence or other to give the king a fair colour to carry the point.†

It will either be said that equity lies of his side, or some words in the law will be found sounding that way, or some forced sense will be put on them; and, when all other things fail, the king's undoubted prerogative will be pretended, as that which is above all law, and to which a religious judge ought to have a special regard.†
*

But those who bear their punishment patiently, and are so much wrought on by that pressure that lies so hard on them, that it appears they are really more troubled for the crimes they have committed than for the miseries they suffer, are not out of hope, but that, at last, either the Prince will, by his prerogative, or the people, by their intercession, restore them again to their liberty, or, at least, very much mitigate their slavery.†

Definition:

a right reserved exclusively for a particular person or group