Fire Emblem: The Age of Legend
1A 1300 is commonly held to mark the end of the First Age, the Age of Legend. This is because the historians in the prominent city of Magrath believed that the last humans of the Third Generation had died out and that therefore there were none of the First Generations left in Fomorti. Some historians now contend that there were still a few dozen men and women of the Third Generation living on elsewhere in Feryngia however.
It is not actually clear though that 1300 years had passed since the first humans emerged from the Old Place though. That estimate for the beginning of the era was set down by Eekanu in what he deemed to be 1A 1032 and only after that date became accepted did historical dates begin to be fixed and certain.