The biblical institution of a levirate marriage was a form of polygyny.
From the en.wikipedia.org
This levirate marriage helps provide support for her and increases his number of wives.
From the en.wikipedia.org
All tribes practiced sororate and levirate marriages.
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Efforts by Henry to appeal to Jewish scholarship concerning the contours of levirate marriage were unavailing as well.
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He's single, and under the little-known levirate law, a single man must wed his brother's widow if the marriage produced no children.
From the buffalonews.com
It is believed, but not historically verified, that Bumbutai married Dorgon after Hong Taiji's death, since levirate marriage was a common practice among Mongols then.
From the en.wikipedia.org
In Korowai society the forms of institutional levirate and predominance of avuncular relationships are found, as well as a kind of affinal avoidance relationships.
From the en.wikipedia.org
Emerton regards the evidence for this to be inconclusive, although classical rabbinical writers argued that this narrative describes the origin of levirate marriage.
From the en.wikipedia.org
More examples
The biblical institution whereby a man must marry the widow of his childless brother in order to maintain the brother's line
Levirate marriage is a type of marriage in which the brother of a deceased man is obligated to marry his brother's widow, and the widow is obligated to marry her deceased husband's brother. ...
A social custom under which a man has both the right to marry his dead brother's widow and the obligation to provide for her.