Fire Emblem: The Age of Legend
The First Age is the preferred term among historians for the Age of Legend. It is the long time period in which the First Generations walked Fomorti and accomplished superhuman feats of all sorts. It is contrasted with the Second Age, the modern period. As the very ideas of organizing time and keeping track of history were not come up with until some point in this era, it’s beginnings are uncertain and labelled somewhat arbitrarily. It is commonly held to span from 1A 1 to 1A 1300, though again the exact length of it has only been guessed at and some think it was actually far longer. This convention was more or less established by Eekanu, the so-called “Mother of History” who declared the date he was writing to be 1A 1032 based on what he could best guess from the memories of the few surviving people of the First Generation.
In this time period a wild and chaotic world was tamed and the basic building blocks of human culture and civilization were invented from wholecloth, but it is more the stuff of heroic legend and epics than the tamer and more orderly history of the modern era.
Dates from the First Age are again rather hazy until rather close to 1A 900 or 1000 or so when historians began to appear in numbers, but even then much is uncertain. Years of the First Age are preceded by 1A for 1st Age to distinguish them from Second Age dates that begin 2A.