The discipline of international criminal law deals with the most serious crimes of concern to the international community, for which the responsible individuals shall bear criminal responsibility. Being firmly entrenched in substantive laws of national legal jurisdictions, the principle is not novel in international criminal law and is traceable to the celebrated Nuremberg Judgment. At the outset of the trial in Nuremberg, it was challenging to argue that the precedent of individual criminal responsibility for core international crimes, which called for the universal condemnation, a priori existed. In his renowned opening statement, Robert Jackson laid down his arguments as to the relevance and necessity of the principle of individual criminal responsibility in international law: