Consanguinity — can't normally marry first cousins or uncle to niece as a minimum. In the middle ages, there were sometimes more stringent restrictions like second or third cousins even. Affinity is the same but through marriage rather than blood. As a minimum no marrying of one's own step parents, parents-in-law, close former in-laws etc., but siblings should be problematic too.
With the introduction of godparents, they shouldn't be able to marry their own godchildren, and marrying the bio children or other godchildren of one's godparent should be problematic.
Problematic = needing dispensation, which could rely on papal opinion and some other stuff.
Per se godparents would substitute for deceased or incapacitated parents, especially with regard to religious aspects of one's education. However, this could also mean a similar bond as between a tutor and ward.
Finally, known spouse killers should be banned from marriage, and characters should be banned from marrying people whose spouses they've killed. (Other than a battlefield kill, true accident while out hunting or anything else not related to making oneself or one's intended target free to marry.) This is a long-standing tradition in Catholic canon law.
With the introduction of godparents, they shouldn't be able to marry their own godchildren, and marrying the bio children or other godchildren of one's godparent should be problematic.
Problematic = needing dispensation, which could rely on papal opinion and some other stuff.
Per se godparents would substitute for deceased or incapacitated parents, especially with regard to religious aspects of one's education. However, this could also mean a similar bond as between a tutor and ward.
Finally, known spouse killers should be banned from marriage, and characters should be banned from marrying people whose spouses they've killed. (Other than a battlefield kill, true accident while out hunting or anything else not related to making oneself or one's intended target free to marry.) This is a long-standing tradition in Catholic canon law.
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