Artículo 1º.- Nadie podrá ser sancionado por un hecho que la ley penal no tipifique como punible ni sometido a penas o medidas de seguridad que aquélla no haya establecido previamente.
1. A person shall not be criminally responsible under this Statute unless the conduct in question constitutes, at the time it takes place, a crime within the jurisdiction of the Court.
2. The definition of a crime shall be strictly construed and shall not be extended by analogy. In case of ambiguity, the definition shall be interpreted in favour of the person being investigated, prosecuted or convicted.
3. This article shall not affect the characterization of any conduct as criminal under international law independently of this Statute.