Era beginning/end
The beginning of the Third Aeon is the formal coronation of Animar The Honored who took the name "Arteas" which meant "Of Artea" in memory of the homeland that Humankind had lost. Animar then married Ellicia Arteas and declared her his queen. Even naming the new kingdom after her. Thanod of the Heights, a fellow Law-Giver and priest of The Old Faith presided over Animars coronation and wedding.
By all historical information uncovered. Animar was the first King in Human history. As he would eventually be crowned as the first Emperor as well.