polygamy
Hey, polyandry is a thing too.
Seriously though, I'd like to wait for Anaris's input before we expand the feature complication with socially progressive concepts in a medieval-based game, even if we're enlightened players and the game isn't meant to be an exact simulation.
I mean, its not period, but it neither is the Beppo, female captains, or warrior queens. Let's do it.
I'm going to wait until Anaris's input, before I say let's do it, for the same reasons as above.
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I like the additional suggestions by Renodin. Chenier's suggestion is sensible for simple marriages; if we do decide to allow polygamy/polyandry, it might be too much tooltip.
I do like the idea of a noble proposing to another in the region, the other accepting, giving them the Engaged status. And requiring a priest to make an official marriage. And the couple and the priest must all be of the same religion. At this point, I'm not certain how I would structure the priest-official-ceremony mechanic. I think the priest inviting an Engaged couple within a region to complete their ceremony would be simplest code-wise.