The Great King's Official Rule Begins
Political event
The Great King
Founding
The "Last Great King" officially begins his rule and the current calendar in most civilized nations is based upon this event.
I really do try to make most of this original, but since Forgotten Realms is an integral part of the world I can't help if anything is used without formal permission, but is still "fair use" as I am just using this for my private games.