Polygamy has been a common practice for Thousands of Years
Will it be possible for some faction rulers to have Multiple Spouses? It's a common fact in real life that there are Many cultures now and throughout history that have supported polygamy. Sultans in Middle East have and had multiple wives. Even most of the men in the Bible have/had multiple wives. This is a Fact that is often over-looked by Western Cultures.
Seeing as how Elemental is a "Fantasy Game" I don't honestly see why it should be limited to having every culture in the game having a ruler that can't take as many wives as he wants. An evil ruler who rules his people with an iron fist would even be more likely to plain out TAKE a Woman when-ever he wants too (there's also nothing to say a female ruler couldn't do it as well).
I also think this would be a great way to add Meaningful Differences between the cultures and factions in game. By having multiple wives and multiple children by those wives it would greatly affect how the dynasty system plays out and how it effects game-play as a whole. In the future and possibly for expansions please consider adding in the ability for a faction to have a ruler that can take multiple spouses. Thank you and that is all...for now.