Quod in se malum ubicunque factum fuerit, nulla juris positivi ratione valebit.
What shall have been done, bad in itself, will be valid by no kind of positive law.
Quod initio vitiosum est, non potest tractu temporis convalescere.
What at first is faulty, cannot, in process of time, become valid.
Quod lege tuum est, amplius esse tuum non potest.
What is yours by law, cannot be more yours.
Quod nullius est, fit domini regis.
What belongs to none, becomes the property of the king.
Quod nullius est, fit occupantis.
What belongs to none, becomes the property of the occupier.