... this personal liberty, is, that every Englishman may claim a right to abide in his own country so long as he pleases; and not to be driven from it unless by the sentence of the law. The king indeed, by his royal prerogative, may issue out his writ ne exeat regnum, and prohibit any of his subjects from going into foreign parts without licence[m]. This may be necessary for the public service, and safeguard of the commonwealth. But no power on earth, except the authority of parliament, can send any subject of England out of the land against ... — Commentaries on the Laws of England - Book the First • William Blackstone