Nigeria

(1) There shall be a Court of Appeal.
(2) The Court of Appeal shall consist of –
(a) a President of the Court of Appeal; and
(b) such number of Justices of the Court of Appeal, not less than forty-nine of which not less than three shall be learned in Islamic personal law, and not less than three shall be learned in Customary law, as may be prescribed by an Act of the National Assembly. (Sec. 237)

(1) An appeal shall lie from decisions of a customary Court of Appeal to the Court of Appeal as of right in any civil proceedings before the customary Court of Appeal with respect to any question of Customary law and such other matters as may be prescribed by an Act of the National Assembly.
(2) Any right of appeal to the Court of Appeal from the decisions of a Customary Court of Appeal conferred by this section shall be –
(a) exercisable at the instance of a party thereto or, with the leave of the Customary Court of Appeal or of the Court of Appeal, at the instance of any other person having an interest in the matter;
(b) exercised in accordance with any Act of the National Assembly and rules of court for the time being in force regulating the powers, practice and procedure of the Court of Appeal. (Sec. 245)

(1) For the purpose of exercising any jurisdiction conferred upon it by this Constitution or any other law, the Court of Appeal shall be duly constituted if it consists of not less than three Justices of the Court of Appeal and in the case of appeals from –
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(b) a Customary Court of Appeal, if it consists of not less than three Justices of Court of Appeal learned in Customary law. (Sec. 247)

The Customary Court of Appeal of the Federal Capital Territory, Abuja shall, in addition to such other jurisdiction as may be conferred upon by an Act of The National Assembly Exercise such appellate and supervisory jurisdiction in civil proceedings involving questions of Customary law. (Sec. 267)

(1) A Customary Court of Appeal of a State shall exercise appellate and supervisory jurisdiction in civil proceedings involve questions of Customary law.
(2) For the purpose of this section, a Customary Court of Appeal of a State shall exercise such jurisdiction and decide such questions as may be prescribed by the House of Assembly of the State for which it is established. (Sec. 282)

(1) In exercising his powers under the foregoing provisions of this Chapter¹¹ in respect of appointments to the offices of Justices of the Supreme court and Justices of the Court of Appeal, the President shall have regard to the need to ensure that there are among the holders of such offices persons learned in Islamic personal law and persons learned in Customary law.
(2) For the purposes of subsection (1) of this section –
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(b) a person shall be deemed to be learned in Customary law if he is a legal practitioner in Nigeria and has been so qualified for a period of not less than fifteen years in the case of a Justice of the Supreme Court or not less than twelve years in the case of a Justice of the Court of Appeal and has in either case and in the opinion of the National Judicial Council considerable knowledge of and experience in the practice of Customary law. (Sec. 288)

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61. The formation, annulment and dissolution of marriages other than marriages under Islamic law and Customary law including matrimonial causes relating thereto.
… (Second Schedule – Legislative Powers, Part I – Exclusive Legislative List)