Nulla poena sine lege

Peru

Political Constitution of Peru 1993 (2009)

TITLE I
PERSON AND SOCIETY

CHAPTER I
FUNDAMENTAL RIGHTS OF THE PERSON

Article 2

d. No one shall be prosecuted or convicted for any act or omission which was not previously prescribed in the law, expressly and unequivocally, as a punishable violation, or did not constitute an offence penalized by law.

Rome Statute

Article 23 Nulla poena sine lege

A person convicted by the Court may be punished only in accordance with this Statute.