Taiwo Aoko v. Adeyeye Fagbemi & Anor (1961) 1 All NLR 400

Background & Parties

This case stands as a seminal authority on the supremacy of the Nigerian Constitution over customary law, particularly in the realm of criminal justice. The applicant, Taiwo Aoko, was a woman married under native law and custom to the first respondent, Adeyeye Fagbemi. The case arose from a charge of adultery brought against her in the Ijebu-Ijesha Grade 'D' Customary Court. The core legal problem was whether a conviction for an act considered an offence under unwritten customary law could stand in the face of a written constitution that guarantees fundamental rights.

Material Facts

• The applicant, Taiwo Aoko, was charged in a Customary Court for "committing adultery by living with another man without judicial separation."
• The charge was based on the native law and custom of the Ijebu-Ijesha people, under which adultery was a punishable wrong.
• Aoko initially pleaded guilty to the charge.
• Despite her plea, the Customary Court proceeded to hear evidence and subsequently convicted her.
• She was sentenced to a fine or, in default, a term of imprisonment, and was also ordered to pay compensation and costs to her husband.
• Dissatisfied, Aoko applied to the High Court of Western Nigeria to quash the conviction and the consequential orders, arguing they were unconstitutional.

Real Issue

The central tension was the direct conflict between the unwritten rules of customary criminal law and the newly enacted written Constitution of Nigeria (1960). The real issue was whether the constitutional provision guaranteeing that no person shall be convicted of an offence not defined in a written law could invalidate a conviction under a long-standing, albeit unwritten, customary law.

Legal Issues

1. Whether a conviction for adultery under native law and custom is valid when adultery is not defined as a criminal offence in any written law applicable in the Western Region of Nigeria.
2. Whether Section 21(10) of the 1960 Constitution of Nigeria, which prohibits conviction for unwritten criminal offences, overrides the jurisdiction of a Customary Court to enforce customary criminal law.
3. Whether a plea of guilt to a charge that does not constitute a legally recognized offence can sustain a conviction.

Court's Analysis

The High Court, presided over by Fatayi-Williams, J., engaged in a critical balancing act between recognizing the place of customary law in Nigerian society and upholding the supremacy of the new constitutional order. The court acknowledged that adultery was considered a wrong under customary law. However, it found the language of Section 21(10) of the 1960 Constitution to be clear and unequivocal.

The provision established the principle of nullum crimen, nulla poena sine lege (no crime, no punishment without a law) as a cornerstone of Nigerian criminal jurisprudence. The court reasoned that the term "written law" as used in the Constitution did not encompass unwritten native law and custom. Therefore, for a criminal conviction to be valid, the offence must be explicitly defined and a penalty prescribed in a statute, such as the Criminal Code. Since adultery was not a crime under the Criminal Code applicable in Southern Nigeria, the Customary Court had acted beyond its powers. The court sacrificed the enforcement of a customary norm to establish the paramountcy of constitutionally guaranteed rights.

Decision & Outcome

The High Court ruled in favour of the applicant, Taiwo Aoko. The conviction for adultery was quashed, and all consequential orders, including the fine and compensation, were set aside.

Ratio Decidendi

A person cannot be convicted of a criminal offence in Nigeria unless that offence is defined and the penalty for it is prescribed in a written law. Unwritten customary law does not satisfy the constitutional requirement of a "written law" for the purpose of creating criminal liability.

Significance

The judgment in Aoko v. Fagbemi is a landmark decision in Nigerian constitutional law. It firmly established the supremacy of the Constitution over all other laws, including customary law. It entrenched the principle of legality in Nigerian criminal law, ensuring that citizens can only be punished for acts specifically proscribed by statute. The case clarified the territorial application of criminal law, highlighting that while adultery is a criminal offence under the Penal Code in Northern Nigeria, it is not so in the South. This decision remains a vital precedent for the protection of fundamental human rights against arbitrary punishment under uncodified rules.