Ernst Rosenberg is a count and the high steward of Eins von Granzreich. He has been behind many of the obstacles the four younger princes encountered in their path to the throne.
Ernst is a good-looking gentleman who's always dressed well, complete with a top hat. He has wavy shoulder-length white hair and narrow red eyes. He is always seen carrying a cane.
Ernst is a mysterious person who keeps many secrets under his smile. He acts friendly and polite, but is actually very manipulative and crafty, causing troubles to the other princes. He also seems to enjoy teasing people.
Count Ernst has come from a family who has been serving the royal family for years. Now, he is positioned to serve Prince Eins as his high steward.
Throughout the story so far, Ernst has seen to be manipulating behind the scenes to trip the four other princes. Ernest appears in the story exposing Licht's job to Viktor. Naturally, that made the king angry and was opposed to let this continue. But then, Viktor changed his mind after re-consideration.
Next, Ernst allowed a Professor faraway from the palace to invite Prince Bruno to leave the palace and study alongside him. But, Bruno decided to reject the offer after discussing with Heine, expressing his wishes to become king for the best interests of the kingdom residents and lifetime goal. This second-time disruption involving Heine caused Ernst to investigate Heine's background.