There was a story in the past before Adeline was born to this world. The Empire has a Crown Prince. His name is Zenista De Estefan. Brother of Cedric and Erwin. Before Erwin was born in the royal family.
Zenista, the Crown Prince disappeared at the age of 7. Disappeared without a cause and without even a trace from him. The royal family for no apparent reason, finally closed the case and told all the people that Zenista had died because of kidnapping.
After that day, Cedric took over as Crown Prince to replace his older brother who had died. A year later when Cedric became Crown Prince. The Empress gave birth to a son. The son was Erwin and he became the second Prince of the Empire.