An impressive corpus of legal literature has accumulated in the last few years on the question whether it is possible or desirable to have an arbitral award enforced under the 1958 New York Convention on the Recognition and Enforcement of Foreign Arbitral Awards1 despite the award's having been annulled in the State where it was made. The issue is important not only in the context of the New York Convention, which itself is the most widely used vehicle of recognition and enforcement of foreign arbitral awards,2 but also in the context of other international documents3 or national law provisions modelled on the Convention4 and bilateral treaties that incorporate it by reference.5 The debate has largely centred on two well-known cases, Hilmarton and Chromalloy. It is the purpose of this article to analyse those cases and other relevant case law and offer a comprehensive analysis of the relevance of judicial decisions of the State of origin for purposes of enforcement under the New York Convention. In doing so this article proposes to discuss both the technical aspects of the relevant provisions of the Convention, and in particular their interrelationship, and the issues of legal policy that arise. Though the discussion will touch upon the wider doctrinal question of the degree of independence of arbitral proceedings from the law of the arbitral situs.