The known history of Faerûn spans thousands of years, extending back into the misty epochs of the creator races and the ages of the first nations of the elves and dwarves. Comparatively recent history is the story of the rise and deeds of humans and other younger races.
Much of this is known mainly by sages, some of whom have been alive for the last few centuries of Faerûn's history. The common folk across the continent have little knowledge of, and little use for, events that have transpired far away in time and space.