|First appearance||Zelda: The Wand of Gamelon (1993)|
|Kindred||King Harkinian (cousin)|
Princess Zelda (first cousin once removed)
- "Please, Your Omnipotence, have mercy!"
- — Duke Onkled
At the beginning of the game, King Harkinian announces that Gamelon is under attack by Ganon's forces, and thus, he travels to the island to aid Duke Onkled. King Harkinian does not return for a month however, and with Link gone as well, Princess Zelda and Impa travel to Gamelon to investigate. Once there, they find that Duke Onkled is corrupt and working for Ganon. Because of this, the two hunt down Onkled and force him to reveal the locations of the prisoners, including King Harkinian.
At the end of the game, after Ganon is defeated, Duke Onkled is forced to "scrub all the floors in Hyrule" as punishment for giving into Ganon.