Clandestinity is a diriment impediment in the canon law of the Roman Catholic Church. It requires the presence of witnesses to the marriage vows, one of which must be a priest, in order for the marriage to be valid. Annulment is a legal procedure for declaring a marriage null and void. ... Canon Law is the ecclesiastical law of the Roman Catholic Church. ... It has been suggested that this article or section be merged with Catholicism. ...
It was promulgated by the Council of Trent in the decree called Tametsi. Prior that time, an unwitnessed exchange of marriage vows was deplored but valid, and the decree was enforced only in those regions where it could be proclaimed in the vernacular The Council of Trent is the Nineteenth Ecumenical Council of the Roman Catholic Church. ...
The witnesses must be the parish priest, or another priest with permission either from the parish priest or the local ordinary, and the other two witnesses must be capable of giving witness to the marriage vows.
It was latter modified to provide that the priest was not necessary if one of the marrying parties was in danger of death, or the vows could not be exchanged before a priest in a reasonable amount of time.