The Improved Emperor's Guide to Tamriel
The first draft of an illustrated guidebook depicting the regions of Tamriel, circa 2E 578
The Improved Emperor's Guide to Tamriel was a 224-page illustrated guide included with physical copies of the Imperial Edition of The Elder Scrolls Online. The timeframe of the guide is contemporary to the game, which itself is set in 2E 582.
You can read about the Guide here.
The following pages are transcripts of the guide.