The Duke of Weselton arrived in Arendelle for Elsa's coronation, intent on opening up trade routes between the two kingdoms. He is an eccentric, flamboyant character.

When Elsa revealed her powers, the Duke instantly labeled her a monster. Throughout the rest of the movie, he doesn't show too much care about anyone else; he just wants the situation to pass so he can get to trading with Arendelle. At the end of the film, Elsa decides to not do trades.

Many characters often mis-pronounce the Duke's title as the "Duke of Weasel-town," which he always hurriedly corrects.