"Violence, fraud, the prerogative of force, the claims of superior cunning—those are the sources to which titles may be traced. The original deeds were written with the sword, rather than with the pen; not lawyers, but soldiers, were the conveyancers; blows were the current coin given in payment; and for seals, blood was used in preference to wax. Could valid claims be thus constituted? Hardly. And if not, what becomes of the pretensions of all subsequent holders of estates so obtained? Does sale or bequest generate a right where it did not previously exist?"