Maybe this is refering to the chancellor in 1000 ad. Remember u have to save him. (But I don't remember how.)
edit: I'm starting to remember now... After beating Rust Tyrano in Giants Claw, the ppl in the castle (1000 ad) will say that the king was put on a trial. So maybe this is refering to the king! (Makes more sence!!). Well, here's how to do it:
In the castle, climb the stairs to the right of the entrance to reach the courtroom. The chancellor says that the king sold the Rainbow Shell for cash, but the king denies ever hearing of the Rainbow Shell. In order to prove his innocence, you'll have to find it. Head down the stairs to the ground floor. There should be some stairs to your right. Head down them and you'll overhear two mosters gloating about how their boss intends to frame the king. You must now battle a series of very wimpy monsters in the basement. However, there are some very good treasures down here. Eventually you'll find the Rainbow Shell, which you can take a piece of and return to the courtroom. However, the king has already been pronounced guilty! Luckily, Marle arrives and shows everyone the piece of the Rainbow Shell, proving the king's innocence. However, the chancellor reveals his true identity: Yakra XIII! This guy may seem impressive, but he's only a mediocre boss who doesn't require any major strategy to beat. Just watch out for his needle attacks. When the battle is won, Marle and the king finally set aside their differences.