Marriage Banns
The term "Marriage Banns" refers to the proclamation in church of a proposed wedding, to be read on three successive** Sundays in the parish churches of  the bride and bridegroom. They can also be written up and posted on the church door or other prominent location within the parish, for a minimum of 14 days.
Posting or reading of the Banns is so that those who know of any impediment to the marriage can make an objection. The practise is still in use today (2005), although there is talk of ending it.

The Banns were often bypassed by the better-off by obtaining a marriage licence, which had to be paid for. Sometimes those of the upwardly mobile classes would marry by licence, just to show how well off they were. The wealthy didn't like to invite every person in the parish to object to their marriage.

The custom of announcing a forthcoming marriage during Divine Service was probably taken over from pre-Christian practice, but it seems to have developed especially after Charlemagne's order for inquiry before marriage into possible consanguinity between the parties. The practice was enjoined by the Synod of Westminster of 1200 and the Lateran Council of 1215.

During the Commonwealth period between 1653 and 1660, marriages were civil contracts performed by a Justice of the Peace and the Banns could also be read in the town market place, or other places such as private homes,on three successive market days. These Banns were sometimes recorded in a separate book and sometimes in the parish register, with the letter M (for market) added.

** The original "Tridentine Legislation" called for "three consecutive holy days". This was the original Catholic requirement for reading the Banns and is largely followed for all marriages, even in the Church of England, using three consecutive Sundays.

Following the breach with Rome under Henry VIII , ( 1509-1547 ) the Book of Common Prayer directs that the banns of all who are to be married shall be published on three several Sundays or Holy Days during the time of the morning service or of evening service.