Macropedia Terradoma, Imperium Edition began before the end of the Imperium. The Last Emperor hoped the scholars he chose would document the many successes of the Imperium and solidify both his and the dynasty's legacy. However, he passed heirless, and the "death spiral" to the Second Decline began. The scholars chose to write as Scholars and not necessarily as puppets of the last dynasty of the Imperium.
Recent Changes (since flagging macropedia for edit/publication).
Here is a sketchy timeline of events within this Lexicon.