- the Synods were local synods that were at times Frankish Synods that were influenced by the secular government… Catholic Encyclopedia speaks of this too. My point is that they were local synods in the West but not necessary Synods where the Pope was even present. Thus they might not truly show the Catholic view, as the Catholic view needs to be developed together with the Pope, even if in a council. The same can be applied to the penitentiary books.
"Whilst the popes constantly rejected absolute divorce in all cases, we find some of the Frankish synods of the eighth century which allowed it in certain acute cases. In this regard the Council of Verberie (752) and Compiègne (757) erred especially. Canon ix of the first council is undoubtedly erroneous (Labbe, VIII, 407). In this canon it is laid down that if a man must go abroad, and his wife, out of attachment to home and relatives, will not go with him, she must remain unmarried so long as the husband is alive whom she refused to follow; on the other hand, in contrast to the blameworthy woman, a second marriage is allowed to the husband: “If he has no hope of returning to his own country, if he cannot abstain, he can receive another wife with a penance.” So deeply was the pre-Christian custom of the people engraven in their hearts that is was believed allowance should be made for it to some degree. Canon v seems also to grant the unauthorized permission for a second marriage. It treats of the case in which the wife, with the help of other men, seeks to murder her husband, and he escapes from the plot by killing her accomplices in self-defence. Such a husband is allowed to take another wife: “That husband can put away that wife, and, if he will, let him take another. But let that woman who made the plot undergo a penance and remain without hope of marriage.” Some explain this canon to mean that the husband might marry again after the death of his first wife, but that the criminal wife was forbidden forever to marry. This last is in agreement with the penitential discipline of the age, because the crime in question was punished by life-long canonical penance, and hence by permanent exclusion from married life.
In its thirteenth canon (according to Labbe, VIII, 452; others call it the sixteenth), the Council of Compiègne gives a somewhat ambiguous decision and may seem to allow absolute divorce. It says that a man who has dismissed his wife in order that she might choose the religious life, or take the veil, can marry a second wife when the first has carried out the resolution. Nevertheless, the intended choice of the state of Christian perfection seems to imply that this canon must be limited to a marriage that has not been consummated. Hence it gives the correct Catholic doctrine, of which we shall speak below. This must also be the meaning of canon xvi (Labbe, VIII, 453; others, canon xix), which allows the dissolution of a marriage between a leper and a healthy woman, so that the woman is authorized to enter upon a new marriage, unless we suppose that here there is a question of the diriment impediment of impotence. If these canons were really intended in any other sense, then they are contrary to the general doctrine of the Church. Other canons, in which separation and second marriage are allowed, refer undoubtedly to the diriment impediments of affinity and spiritual relationship, or to a marriage contracted in error by persons one of whom is free and the other not free. Hence they have no reference to actual divorce, and cannot be interpreted as a lax concession to popular morals or to passion. "
link:
newadvent.org/cathen/05054c.htm
en.wikipedia.org/wiki/List_of_Frankish_synods