Nulla poena sine lege

Federal Republic of Nigeria

Constitution of the Federal Republic of Nigeria 1999

Chapter IV
Fundamental Rights

36. (8) No person shall be held to be guilty of a criminal offence on account of any act or omission that did not, at the time it took place, constitute such an offence, and no penalty shall be imposed for any criminal offence heavier than the penalty in force at the time the offence was committed.

Rome Statute

Article 23 Nulla poena sine lege

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