Duke of Weselton

Duke of Weselton is the main antagonist of the 2013 animated film Frozen.

Disney Biography
What the Duke of Weselton lacks in stature, he makes up for in arrogance and showboating. He’s determined to get close to the new queen—that is, until Elsa’s magical secret is revealed. Then he’s the first to call her a monster and try to turn her own kingdom against her—anything that might help him exploit Arendelle’s tradable goods.

Trivia

 * Elsa was thought to be the main antagonist, but Disney decided to make the Duke the antagonist to make it more interesting.