1.1 Background of the Study
Marriage is a universal institution recognized and respected throughout the world. As a social institution, marriage is founded and governed by the social and religious norms of society . Therefore, the sanctity of marriage is a well-accepted principle in the world community. Marriage is the root of family and society. However, by looking at the types of marriage in Nigeria, therefore, unlike most European countries two marriage systems are recognized in Nigeria, namely, monogamous and polygamous . These two marriage systems differ fundamentally from character and incidents. It is therefore important to take this duality into account in any consideration of marriage laws in Nigeria in order to avoid confusion. In all cases concerning marriage, the lawyer in Nigeria must first determine the type of marriage involved before he can apply the appropriate law . However, monogamous marriage is Nigeria is the same as in England. It is marriage that Lord Pensance called voluntary union for the life of one man and one woman to the exclusion of all others, whereas polygamous marriage can be defined as a voluntary union for life of a man with one or more wives (Cottrell, 2013). Its essential characteristic is the ability of the man to take as many women as he wants. The mere fact that he has at one time only one woman does not affect the character of the marriage as long as the capacity to take more women is preserved. Generally, there is no limit to the number of wives a husband could take under the polygamous system. It always depends on its affluence .
 Marriage is an institution that represents all the behaviors, norms, roles, expectations and values associated with the legal union of a person or a union of persons who are most often of the opposite sex involving a man and a woman.  This is one of the major events in life that marks the transition to mature adult life and represents a lifelong commitment of two people to each other.
As a system, marriage is carrying out, following a series of colossal procedures as practiced and understood by the cultures of the parties concerned. Different communities recognize patterns and types of marriages according to their cultural / social worldview . Nigeria, as part of the wider African society, has been generally characterized by arranged marriages, polygamous marriages and others. Old tribal traditions disappear and more Nigerians adopt Western marriage concepts . This trend has led to an unprecedented increase in customary law marriage in Nigeria. Boateng, cited in Ardayfio-Schandorf, observed that family origins and ethnic origins that were of considerable importance in the traditional practice of marriage were replaced by love and affection between partners .
1.2 Statement of the Problem
 The dynamics of culture and human relations allowed researchers to observe many influences, manifestations and occurrences in marriage within Nigerian society. These manifestations and occurrences have had a significant impact on the stability of marriage in modern Nigerian society. A recent observation of people’s attitudes towards marriages in the country has revealed the alarming negative effect of these events (Animasahun and Fatile 2011). The factors that militate against the quality of marriage in Nigerian society of the 21st century have been the subject of discussions between Nigerian social psychologists, religious authorities, behavioral psychologists, sociologists and anthropologists
However, substantial research has reinforced cultural differences as a source of instability, conflict or dissatisfaction for couples , rather than an opportunity for transformation. Many conclude that intercultural couples are confronted with higher levels of marital challenges; Are more prone to failure; and are rooted in conflicts related to dormant allegiances of worldview, family structures and models of communication . This work explores the dynamics that promote the legal effects of customary marriage in marriages in Nigeria to determine the prospects for these marriages in the 21st century. It also shows that intercultural marriages offer opportunities for a positive transformation of the negative tendency of marriages rather than widespread opinions that present them as intrinsically problematic .
1.3 Purpose of the Study
The aim of the contemporary study was to examine the legal effects of customary law marriage in Nigeria. The specific objectives of this study are:
- To define marriage, types of marriage in Nigeria.
- To identify the types of customary law marriage in Nigeria and the requirement for a valid customary law marriage in Nigeria.
- Examine the legal effect of customary law marriage and the effects of contacting statutory marriage with the same person(double-decker marriages).
Explore the legitimacy of children of customary law marriage, rights of women in intestate succession and the resolution of customary law marriage in Nigeria.
Make recommendations that will help solve the problems of inter-cultural marriages.
1.4 Significance of the Study
The contribution of this study to Nigerian society cannot be overemphasized. This survey aims to bridge the gap in the existing literature on customary marriages in Nigeria. Most books on the subject do not provide a sufficient theoretical framework for customary marriage.
The study will also provide information to future spouses, families and adults who need to learn about the legal effects of customary marriage in Nigeria. The study will be useful to future researchers on the subject. It will complement the many literatures on the subject in the Library. The work will be useful to posterity. Ethnic families may want to learn strategies to deal with any threat of polygamous conflict in their marriages and life.
1.5 The Scope of the study
The study will cover the whole of Nigeria. The marriage of customary law throughout the study is seen from the point of view of the Yoruba, marrying Igbo, Efik or Hausa, etc., or vice versa. This work not only examines the concept of marriage, but takes a step forward in identifying the problems that affect customary marriage in Nigeria. It also highlights the effects of these problems as well as traces the future of customary marriage law in Nigeria.
1.6 Research Methodology
The methodology used in this study is the historical research method. It used primary and secondary data collection sources. Since marriage is universally recognized as the basis of group life and as a requirement for human survival, primary sources of data collection would be drawn from oral interviews of respondents as a reliable means of understanding individual perception of the subject. The legal effects of customary marriage in Nigeria have attracted the attention of a considerable body of literature.
This study would examine relatively recent publications in books, newspaper articles and unpublished theses relevant to the study data that would be collected, organized and analyzed critically.
1.6 Definition of Terms
The term “marriage” as well as culture does not lend itself to a universal definition. Marriage is seen as a close partnership of two different people of opposite sex who have concerted to live and work together as one entity.
The neolocal residence is a type of conjugal residence where a couple establishes an independent domestic unit after marriage. In this type of residence, the couple does not live with their parents; Rather than they live with each other.
The conjugal family is a family that is centered on a woman and her children. In this case, the fathers (s) of these children are present intermittently in the life of the family and occupy a secondary place. The mother of the child is not necessarily the wife of one of the children’s fathers.
The matrilocal residence refers to the domicile in a group whose core includes the mother of the bride. In this type of conjugal residence, the couple lives with the mother of the bride.
The patrilocal residence is a type of conjugal residence where the nucleus revolves around the father of the groom. A patrifocal family is a family centered on the man and family of his father.
 James A., “Marital Status and the Risk of Suicide,” American Journal of Public Health : 78-80, 2012
 Jack C. Smith, “Marital Status and the Risk of Suicide,” American Journal of Public Health: 64-72, 2012
 Conn. “Marital Status and the Risk of Suicide,” American Journal of Public Health: 55-93. 2012
 Cottrell, A. B. Cross-national marriages: A review of the literature. Journal of Comparative Family Studies, 21(2), 151-169. 2013.
 Asana, A., “Culture Shock and the Cross-Cultural Learning Experience, In: Toward Internationalism”.2010
 Gove, Cottrell, A. B. “Cross-national marriages: A review of the literature”. Journal of Comparative Family Studies, 21(2), 151-169. 2013
 Borgatta, Barna, LaRay M. “Stumbling Blocks in Intercultural Communication,” In Milton J. Bennett (Ed.), 2000
 Doki, Readings in Cross-Cultural Communication, ed. by Louise Fiber Luce, 2011
 Aiyetan and Kolapo “Legalize Customary Tenure or to Lay Foundation for the Demise of Customary” 2005
 Ardayfio-Schandorf “Recognition of Customary Marriages” 1990
 Bohanna, Bennett, Milton J. “Overcoming the Golden Rule” In Milton J. Bennett (Ed.), Basic Concepts of Intercultural Communication: Selected Readings. Yarmouth, ME: Intercultural Press. 2014
 Animasahun and Fatile Impact of globalisation on domestic family law: multi-tiered marriage in Nigeria as a case study, 2011
 Jibo, M, “Tiv Endogamy/Exogamy” Paper Presented at 1st National Workshop on Tiv Marriage IMC Kaduna, . 2001
 Crippen, C. “Cross-cultural parenting: Experiences of intercultural parents and constructions of culturally diverse families”. Unpublished doctoral dissertation, University of New England, Australia, 2008.
 Crohn, J. “Intercultural couples. In M. McGoldrick (Ed.), Revisioning family therapy”: Race, culture, and gender in clinical practice (pp. 295-308). New York, NY: Guilford, 1998
 Solomon. “The Basic Principles on the Role of Lawyers adopted at the Eight United Nations Congress on the Prevention of Crime and the Treatment of Offenders”, Pp 28-89, 2012