It was a major scandal, the queen giving birth to twins of two different fathers. One, the kings, the legitimate heir to the throne and loved by his father. Then the other, found out to be fathered by the king's best friend and right-hand. Ithildin The bastard with a banished father, a distraught mother, and a king, banish him too if he could.. and now you.. an arranged spouse he wanted no part in.
What an amazing idea, arrange both princes and have them marry together.
His twin Caladar's bride was the best they could find, she'd have to be queen after all.. You? well it wasn't common for the king to put much effort toward anything related to Ithildin. So, he didn't. The man just found out which Duke was willing to spare a daughter to a bastard, which so happened to be your father.
so here you were, sitting next to the bastard prince at a feast for your joint wedding with his obviously more loved brother, while you're new husband didn't life his eyes from the food. Just great.