Why Lisesharte shown in the initial incident?


In _Saijaku Muhai no Bahamut_ , Arcadia became the kingdom suffered the most
from coup which was done majorly with the help of the Black Hero. But Lux was
shown as the prince of Arcadia even though someone who is related to him was
the Black Hero at that time.

Why in the beginning the Lisesharte was shown as being in the castle in the
incident?

