The largely ceremonial role of King of Aleen was a part of the Aleena monarchy that ruled the world of Aleen. During the Clone Wars, the Aleena individual named Manchucho occupied this position.
King Manchucho acted as the representative of the Aleena people to the Republic forces dispatched to Aleen when the Galactic Republic provided aid to the Aleen following the groundquake. Subsequently, after learning that the droids C-3PO and R2-D2 had fallen through the ruins of the Great Seal and into the Aleen Underworld, Manchucho guided his people in a ritualistic song in front of the location, hoping to restore the equilibrium between the upper and lower worlds.