books.google.ie - In the Western legal tradition, the history of restitution for unjust enrichment reaches back to pre-classical Roman law. In common law, the roots of unjust enrichment may be said to lie in the fourteenth century; but its history as a subject of academic study is much shorter. The law of restitution...http://books.google.ie/books/about/Restitution.html?id=lI46AQAAIAAJ&utm_source=gb-gplus-shareRestitution