[tom the terribl]

This quest has two pre-requirements that must be done before you can complete this task. This however is part of the quest so I'll put the answer below:
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First - you must have gotten the quest from Raven to research Terwilliger in Tarant, part of the main story.

Second - You must talk to Willoughsby in the town hall in Tarant after getting the Terwilliger task.

Now the King will be in Caladon Castle.