Duke of Weselton

"Sorcery! I knew there was something dubious going on here!"

- The Duke after Elsa's powers were revealed

The Duke Of Weselton is the (supposed) secondary antagonist in the 2013 Disney animated film Frozen. He is voiced by Alan Tudyk.

Official Disney Bio

 * "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."

Role in the film
The Duke of Weselton is first seen with his bodyguards entering Arendelle and nearing the castle gates. The greedy royal proves to be extremely excited, deeming Arendelle his most mysterious trade partner, and that he greatly looks forward to unlocking its secrets and exploiting its riches. Along with the other dignitaries, the Duke attends Elsa's crowning coronation as well as the ball thrown in honor of her first night as queen. Anna and Elsa's majordomo, Kai, introduces the snooty duke, which is when the short royal offers Elsa her first dance as queen, claiming he should have the honor being their closest partner in trade. Elsa rejects the offer politely, but volunteers Anna, to which the Duke agrees to nonetheless. Though he believes otherwise, he's a terrible dancer, constantly stepping on Anna's toes and making a complete fool out of himself.

Not too long after the comedic scene, Anna and Elsa get into an argument, and the drama causes Elsa's secret power over ice and snow to be revealed. The fearful Duke calls her out, claiming it to be dark magic, sorcery, and orders his men to capture her the moment she flees. Anna, the visiting Prince Hans, and the Duke follow after the queen, who escapes into the mountains, accidentally casting a powerful curse over Arendelle, putting it into an eternal winter. It begins to snow eerily throughout the land, causing the citizens to worry, though the Duke immediately becomes irrational, panicking, albeit humorously. He then suspects Anna to have powers as well, but the princess denies and explains that Elsa means no harm.

The stubborn Duke finds it hard to believe, and to free the land from the curse, Anna volunteers to go after the queen. The Duke immediately agrees, but her fiancé, Prince Hans wasn't too fond of the idea. Nevertheless, Anna departs, and leaves Hans in charge. Later on, the prince is busy giving away free cloaks and other necessities for the kingdom' inhabitants who are struggling to survive. The Duke scolds Hans on his actions, not wanting the prince giving away any of Arendelle's tradable goods. He also goes and points fingers towards Anna, believing she may be plotting with Elsa, to which Hans immediately snaps at, threatening the Duke with his power to have him arrested for treason. The Duke's silenced until Anna's horse returns alone.

Hans feels she's in danger, and asks volunteers to go in a search with him to find her. The Duke volunteers his bodyguards, and secretly orders them to eliminate Elsa should they find her so they could put an end to the winter. Later on, back at the castle, Hans returns but was unable to find Anna. Elsa, however, was located and imprisoned. Anna then suddenly appears and is left alone in the parlor with Hans after the Duke leaves to give the two privacy. Moments later, Hans returns and tells the Duke and the others Anna's been killed by Elsa after being shot in the heart with ice magic. The Duke is horrified by the news, and officially deems Elsa a menace to society.

The Duke and the other dignitaries are also seen after Anna sacrifices herself to save Elsa from the treacherous Hans. However, they all rejoice once peace was restored and the kingdom is thawed. The Duke, however, is cut off from trading with Arendelle for his irrational behavior towards Elsa during the entire escapade. The Duke tries to claim he was innocent and a victim of fear, but to no avail, and he and his thugs are sent back to Weselton.

Trivia

 * The Duke's voice actor, Alan Tudyk, is also known for voicing King Candy. It should be noted that these characters also share similar traits, in that both are elderly, have a high status, are very strict yet with a comedic side, have two major henchmen (Wynchel and Duncan for Candy, and The Duke's thugs), and are antagonistic towards the main protagonist (who are actually royalty) by calling them a threat.
 * Although his hometown is pronounced as "Whistle-ton," it is often mispronounced as "Weasel-town", which is a pet peeve of The Duke.
 * The Duke is similar to Randall Boggs from Monsters, Inc., in which they first appear as un-pleasant, then show their villainous nature later on and are believed to be the main antagonist until the true hidden villain is revealed. Also, despite being in the same league as the hidden villain, they do not have a good relationship.
 * He is not very evil since he cared for Anna when she returned and he's very shocked when Hans told them Anna is dead. He also one of Han's victims since he lied.