Examples of void marriages include bigamous marriages (where one spouse has legally married two people) or incestuous marriages. (divorcenet.com)
His mother, his aunt, and his uncle swamped the two Carson boys with toys to try to make up for the departure of his bigamous father. (christianitytoday.com)
One of the scandals of the Reformation was the bigamous marriage of Philip of Hesse, conducted by Luther himself. (faith.org.uk)