From the Council of Chalcedon, A.D. 451

Its canons indeed were not received by Leo; nevertheless Dionysius afterwards inserted them into his collection, and the Roman See approved them by use.

Canon XIV. Since in certain provinces it has been conceded to readers and psalmists to marry wives, the holy synod established that it is not lawful for any of these to receive a wife of another sect ... But neither ought one about to be married to be coupled to a heretic or a Jew or a pagan, unless perhaps the person to be coupled to the orthodox person promises to pass over to the orthodox faith. If anyone shall have transgressed this definition of the holy synod, he will be subject to canonical correction.

Cf. Canon XXXI, cited above from the Council of Laodicea. Canon XXXII of the Quinisext Synod in A.D. 692 declared the marriage of an orthodox man with a heretical woman, and conversely, ἄκυρον and to be dissolved; but there is no authority of the same.

Canon XV. If a deaconess, receiving the imposition of hands and remaining for some little time in the ministry, hands herself over to nuptials, doing insult to the grace of God, let one of this sort be anathematized together with him who is coupled to her.

Cf. Canon XLIV of Basil. The rite of imposition of the hand was used in the Greek Church for deaconesses, as its ritual books declare; among the Latins mention of their blessing is still made by the Fathers of the Council of Orleans in A.D. 533, abolishing the same in Canon XVIII.

Canon XVI. It is not lawful for a virgin who has consecrated herself to the Lord God, and likewise for a monk, to contract nuptial rights; but if they have been found perpetrating this, let them be excommunicated. But concerning those who confess, we have decreed that the bishop of the same place have authority to grant them mercy and humanity.

Whether the mercy and humanity of the bishop would be in this, that for certain causes he would permit the marriage, or only that he would impose a milder penance, is not sufficiently clear. The Fathers of Chalcedon seem to have followed Basil (cf. his Canon VI), so that, consequently, just as we have interpreted him, it is lawful also to interpret them.

Canon XXVII. Concerning those who carry off women, even under the name of living together, or those cooperating with or conniving at abductors, the holy synod decreed that, if indeed they are clerics, they fall from their own grade, but if they are laymen, they be excommunicated.