Postliminium

 The return to his own country, and his former privileges, of a person who had gone to sojourn in a foreign country, or had been banished, or taken by an enemy.  Burrill.  [1913 Webster]

 The right by virtue of which persons and things taken by an enemy in war are restored to their former state when coming again under the power of the nation to which they belonged.  Kent.  [1913 Webster]