Faction of a princess?

In the scroll that appear When a foreign princess ask for marriage in my faction, I can see the name of the princess. But I don't know how to see from which faction the princess come from. I want to know this information to know if I agree to make an alliance with the princess's faction. I can watch the AI turn to see which princess come to my territory, but sometimes I'm not aware of.

Can you tell me how to know the faction of a princess from the scroll when a bride is prensented to me.

Ok I've understood how it work now... the bride presented scroll is when a women of my own faction is presented to my heirs. If a foreign princess want to marry one of my heir it is from the diplomacy screen that it is presented. With my own princess I can right click on my general or foreign general (via diplomacy scroll) to marry her.

Sorry for the stupid question :)