Unregistered polygamous marriage creates serious legal problems when the husband dies, because the wife cannot prove her marital relationship in an application for the determination of heirs before the Religious Court. This study aims to analyse the juridical position of a wife from an unregistered polygamous marriage and to examine the extent to which marriage ratification may serve as a basis for the determination of heirs. This is normative legal research using statutory and conceptual approaches, with primary, secondary, and tertiary legal materials gathered through library research and analysed qualitatively. The findings show that such a marriage is valid under Islamic law but has no legal force under Article 6 paragraph (2) and Article 56 paragraph (3) of the Compilation of Islamic Law, so the marital relationship cannot be proven as required by Article 7 paragraph (1). An application for the ratification of a polygamous unregistered marriage must be declared inadmissible under Supreme Court Circular Letter Number 3 of 2018, unless the marital impediment has ceased through divorce or the death of the previous wife. Protection of the wife's civil rights therefore depends on testament, grant, and obligatory bequest, as well as reform of marriage registration policy.
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