CHAPTER III
PART I
SEYCHELLOIS CHARTER OF FUNDAMENTAL HUMAN RIGHTS AND FREEDOMS
Article 19
4. Except for the offence of genocide or an offence against humanity, a person shall not be held to be guilty of an offence on account of any act or omission that did not, at the time it took place, constitute an offence, and a penalty shall not be imposed for any offence that is more severe in degree or description than the maximum penalty that might have been imposed for the offence at the time when it was committed.
Crimes against humanity
Genocide
Individual criminal responsibility
Jurisdiction ratione temporis
Non-retroactivity
Nullum crimen sine lege
Nulla poena sine lege
National penalties - genocide
National penalties - crimes against humanity
EDIT.