Lanefan
Victoria Rules
Factual history, such as who reigned when and what years the red comet appeared, should be fairly reliable in any society a) whose language has a written form and b) puts any value on recordkeeping.Never give them lore straight, filter it through a narrator, Grantus the sage said "...." and the like. Or you recall from your studies that "...."
History is often unreliable and contradicts.
In a typical RPG setting, the longer-lived species would seem to make the best such lore-keepers. For play purposes, a player-visible document or webpage containing such basic factual info can be really useful.