Dawn of The Kingdom of Ateodal, which later becomes Vadaton.
This is the timeline most commonly used by most kingdoms that had any part in the downfall of The Droteron Empire. The Destruction marks the birth for many, so they have chosen that downfall as the starting year.
The second civil war to occur. Again it is the forces of Acreosta that take up arms against the Eagle King Vance Viator rebels against Eagle King Lycaron for the throne and the right of revenge.