User blog comment:Zippertrain85/Are Books valid Lore Sources?/@comment-26896471-20150904190946

The books in Elder Scrolls are the 'Lore' of the Elder Scrolls universe. That is not strictly the same as Canon, which is categorical fact verified by Bethesda. It is through the books that we unravel the history of the Elder Scrolls universe, but, as you say, they are  'written'  by in-game characters and are therefore fallible. Therefore, I would say that only 90% of the history, metaphysics, theology of Tamriel can we say actually know for certain. All we can know for certain in ESO is that which the player-character experiences (i.e. Helgen was definitely burnt down by a dragon). People tend to forget that.