The King of Hyrule is first introduced when Princess Zelda takes Charles, a knight from the land of Moria, to the North Castle so that he may meet the king. The king takes an immediate liking towards Charles, and is quick to trust him so much that he decides to show the knight the Triforce of Wisdom located in the Triforce Room, against Zelda's wishes. The king goes on to dub Charles a Knight of the Triforce}}, asking him to protect it from Ganon's grasp. If Link decides to speak up and ask the king if he has lost his mind, he reminds him they've only known Charles for one day. The king, however, does not care what Link thinks, and silences him while wondering what has gotten into the young hero. Charles comments that he might be restless and needs "to work off steam." The king agrees and decides to make Link his new tax collector, sending him to the Water Town of Saria first thing in the morning.
Later on in the book, the King of Hyrule will explain that there have been strange reports from the citizens of Kingdom of Hyrule stating that an entire gang of Darknuts was spotted in the Jungle of Favors, and that a recent thunderstrom caused for Goriyas to fall from the sky. Fearing for the safety of the Triforce of Wisdom, the king says that they must move the sacred triangle to the Fifth Castle of Ancient Hyrule, which is southeast of North Castle past deserts, rivers and swamps. When Zelda asks who will deliver the Triforce of Wisdom there, the king mentions he has two heroes in mind: Link and Charles. Anxiously, Link awaits the king's decision, but it is soon revealed that Charles will be the one to take the Triforce to the Fifth Castle.
Link furiously reminds the king of all the brave deeds he has done and claims that Charles can't be trusted because he is evil. The king raises his hand and silences Link, saying he better have proof to back up the serious charge he has raised against Charles. If Link doesn't have the Mirror of Truth, the king will banish him to the Tower for three days, which is where the prisoners are kept.
If, however, Link has the Mirror of Truth and decides to use it, the mirror will reveal that Charles is actually Ganon in disguise, who immediately takes this opportunity to steal the Triforce of Wisdom. After Link defeats the false Morian knight and recovers the Triforce of Wisdom, he will return to North Castle to be thanked by the king for saving Kingdom of Hyrule once again.
- "He beckons to Sir Charles. 'To cement the new bond between our kingdoms, we'd like you to see something we call the Triforce of Wisdom.'" (The Shadow Prince (Mammoth) pg. 23)
- "'Your new friend, Charles, is a fine young man. I was thinking...would it be premature to show him the Triforce?' Zelda looks startled. 'Well, I--' [...] 'But our enemy Ganon already has the Triforce of Power,' Zelda says. 'If we lose our Triforce of Wisdom, Ganon would be that much closer to ruling us all.'" (The Shadow Prince (Mammoth) pg. 17)
- "'Wonderful! I hereby dub you a knight of the Triforce,' says the king, beaming." (The Shadow Prince (Mammoth) pg. 78)
- "'I believe Ganon is after our Triforce of Wisdom again. It's in danger here. We must move it.' [...] To the Fifth Castle of Ancient Hyrule.'" (The Shadow Prince (Mammoth) pg. 6)
- "'Charles of Moria will carry the Triforce of Wisdom to its new home,' the king announces." (The Shadow Prince (Mammoth) pg. 102)
- "'And anyway, Charles can't be trusted. He is evil!' The room is in an uproar. The king raises his hand. 'Silence! Link, you've made some very serious charges against Sir Charles. You'd better have proof to back up your words, young man!'" (The Shadow Prince (Mammoth) pg. 103)
- "'Link, I've heard enough. Your petty envy has become more than a nuisance. It's time you were taught some manners. I hereby banish you to the Tower for three days, effectively immediately!'" (The Shadow Prince (Mammoth) pg. 62)