After Eblan Castle was attacked, the people of Eblan fled to the Cave of Eblan. At some unspecified point, Edge left and the King and Queen were abducted by Dr. Lugae, who turned them into chimeric monsters and kept them at the top of the Tower of Babil. Edge, enraged by this, set out with a force of Eblan soldiers to travel through the rear of the Cave of Eblan to reach the Tower of Babil, intent on challenging Rubicante and saving his parents.
When the party visits the upper half of the tower, they face Edge's parents before the two come to their senses, and stop fighting. They then speak to Edge, telling him that he is ready to rule Eblan. Then, they committed suicide by self-destructing. The resulting rage over their deaths and Rubicante's indifference empowers Edge to help him defeat the Archfiend.
During Edge's Tale he travels through the Cave of Eblan and visits the graves of his parents in the same chamber as the Eblan people took shelter in. Edge reflects that being buried there, out of sight, was in accordance with his father's wishes, and thinks that he was a ninja to the end.
The King of Eblan and the Queen of Eblan appear as bosses in the Tower of Babil in Final Fantasy IV. The battle is scripted, and defending the entire fight will secure the player's victory. They are not recorded in the Bestiary.
The King of Eblan and the Queen of Eblan are fought once again in Final Fantasy IV: The After Years within the True Moon when one of the crystals revives past foes. The battle is once again scripted and neither of them attacks, eventually committing suicide, but not before they tell Edge to save Eblan and their world.