Polygyny (from neo-Greek: πολύ poly - "many", and γυνή gyny - "woman or wife") is a form of marriage in which a man has two or more wives at the same time. In countries where the practice is illegal, the man is referred to as a bigamist or a polygamist. It is distinguished from relationships where a man has a sexual partner outside marriage, such as a concubine, casual sexual partner, paramour, cohabits with a married woman or other culturally but not legally recognized secondary partner. Polygyny is the most common form of polygamy; the much rarer practice of polyandry is the form of marriage in which one woman has two or more husbands at the same time.

Polygyny is generally studied by anthropologists rather than by sociologists. Thus, nearly all studies of African polygyny have treated it as a traditional form of marriage inevitably destined to disappear under the pressures of urbanization, wage employment, Christianity and general "modernization" it would appear that no African woman has written in praise of polygyny, although some have accepted it as a lesser evil given the probable alternative of statusless concubinage. The issue of women's perceptions of polygyny has been gravely neglected.

Khalid Yasin (also known as Abu Muhammad and Abu Muhammad Khalid Yasin) (born in 1946) is an American convert from Christianity to Islam who lectures in the United Kingdom and elsewhere.Yasin lives in Manchester, England and has operated a "da'wah" organization which has had various names. It was dissolved in 2010.Yasin frequently travels overseas to spread his faith. He has called himself a "media-bedouin," remarking that the bedouins are willing to settle wherever there is "water and shelter". Yassin is outspoken about a variety of issues in his speeches and media appearences.

Yasin was born in Harlem, New York and raised in Brooklyn as a Christian along with nine siblings. Although not an orphan, he grew up in foster homes from the age of three, along with some of his siblings, until he was fifteen. He describes each foster home as having a different Christian denomination, so he covered a wide spectrum of Christianity. He was put up for adoption due to his family's financial state.

Yasin has described his youth in "the ghetto", where it was "Me and my two brothers Sam and Julius, against the world. We had nothing but converting and accepting Islam now we have everything". When first reading about Islam, he often used Encyclopedia Britannica as a reliable source on Islam and its concepts. Yasin felt the grief of African-American people, and he was especially influenced by the turbulent 1960's and figures like Malcolm X.