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Prince Caleb Westergaard is a supporting antagonist of the 2015 novel A Frozen Heart based on the 2013 Disney film Frozen. He is the eldest son of King Westergaard and the oldest brother of Prince Hans.
As the first son of King Westergaard, Caleb was considered to be his father's favorite of all 13 princes and the one to inherit the throne. Despite being his father's favorite, Caleb was known to be irresponsible in his duties and ignores his own family of gaining more of his father's approval.
Along with his brothers (except for the kind Prince Lars), Caleb enforced his father's will in enforcing high taxes against their people and enjoyed tormenting Hans for their own amusement, and King Westergaard did nothing to stop it and instead encouraged them to continue abusing Hans in hopes of toughening him up. Caleb was also shown to be ignorant towards his own wife, and both Hans and Lars believe that Caleb is unfit to be declared as king because of his behavior.
Being traumatized by torment inflicted by his father and brothers, Hans vows to move out from the Southern Isles and find another kingdom so that he can become a better ruler than Caleb himself. He senses an opportunity when Princess Elsa is about to be crown Queen of Arendelle.
Formulating a plan for power due to his trauma, Hans tries to get himself into marrying either Elsa or her sister Anna so that he could kill them and secure his new power as the new King of Arendelle. However, he is foiled and ends up being sent back on a ship to the Southern Isles for punishment. It can be implied that King Westergaard has gotten Caleb and the other princes to subject Hans to a severe punishment for his failure, much to Hans' dismay.
- Given that Hans is depicted to have been punished by shoveling manure in Frozen Fever and is shown to keep his royal clothes, it's speculated that perhaps Hans' brothers, specifically Caleb, may have realized their fault in turning Hans into a sociopath and thus they gave him a lenient punishment after he was deported back to the Southern Isles and didn't strip him from his royal status.
- It is implied that he (along with Rudi and Runo) were mentioned by Hans in Frozen movie as he said that three of them pretend that he never exists.