Debut: Episode 305

15 years ago a kingdom was invaded by pirates, where 500 of its soldiers were taken hostage, and the captain demanded to be named the new king of the kingdom.

The desperate king was about to accept the request. However, one of his subjects tells him that a government emissary has arrived. Here appears a 13-year-old Rob Lucci, which angers the king by believing that the World Government was mocking them by sending a child. Lucci approached the king, who asked him to save the soldiers, but the boy told the king not to question the ways of the World Government. This left the king very confused about him, since despite being a child, he was terrified of him.

(Source: One Piece Wiki)