As to potential rules and guidelines to Marriages.
I'll assume the SMA (Serious Medieval Atmosphere) as a guiding principal. These are just suggestions and there are multiple suggestions to question as asked by Andrew
Anyone allowed to Marry anyone?
Man and Woman or vice versa, Woman and Man, proposing wise.
Anyone allowed to Marry anyone?
Priest class only. The priest class can declare a marriage.
Anyone allowed to Marry anyone?
Both parties of the marriage must be of the same religion, said priest must also be part of said religion.
Multiple Partners in Marriage?
No
Multiple Partner in Marriage?
If yes then to be specified within a Religion. Religion either allows it or doesn't and thus religious adherents can or cannot marry multiple partners. It should be a limited choice for a Religion, like 1 to 3 partners per person. Ratio as well. 1 male can marry 1, 2 or 3 female partners or vice versa.
Divorce option?
Yes. Priest or Elder of said Religion can annul Marriages. Elder would be most favorable for the game as it adds depth but also development time.
Divorce option?
Maybe. To be set by each particular Religion. Either they allow Divorces or not. Like looting is ''Legal'' or ''Illegal'' realm law.
It doesn't have to be complicated. Could simply go for, Male / Female Marriages. To be agreed upon by both parties, have an invite possibility like issuing a Duel Challenge and if the other party accepts, great. Marriage done. Have it show up someone easily accessible and voila.
