The purpose of banns is to enable anyone to raise any canonical or civil legal impediments to the marriage, so as to prevent invalid marriages. Impediments vary between legal jurisdictions, but would normally include a pre-existing marriage that has been neither dissolved nor annulled, a vow of celibacy, lack of consent, or the couple being related within a prohibited degree of kinship.
The purpose of banns is to enable anyone to raise any canonical or civil legal impediments to the marriage, so as to prevent invalid marriages Impediments vary between legal jurisdictions, but would normally include a pre-existing marriage that has been neither dissolved nor annulled a vow of celibacy, lack of consent, or the couple being related within a prohibited degree of kinship