From the Capitularies of Benedict the Levite, Book III, Capitulum 463, Has Thus

It has been decreed that a wife be legitimately joined to a man. For otherwise, as we have received from the fathers and find handed down from the holy apostles and their successors, marriage does not become legitimate unless the wife is sought from those who seem to have dominion over that woman herself and by whom she is guarded, and is betrothed by the nearer parents, and endowed by laws (legitimately), and in her own time, priestly, as is the custom, with prayers and oblations, is blessed by the priest, and guarded by bridesmen, as custom teaches, and associated by relatives, and sought at the fitting time, is given by laws and solemnly accepted. And for two or three days let them have leisure for prayers and keep chastity, so that good offspring may be generated and may please the Lord in their acts. For thus they will both please the Lord and generate sons not spurious but legitimate and inheritable.

You see that the Franks always had this especially at heart: that nuptials be made with the consent of parents.

From Book II in the same place, chapter 235. Those who, having dismissed their wives for the cause of fornication, lead others are noted by the sentence of the Lord to be adulterers.