What I was thinking was just similar to the graveyard file in the Wastelands however available in game rather than as an out of game reccord. Say your library could be expanded with a historical wing detailing annals of previous rulers of Aslona which you could then read.
If you wanted to have it affect current gameplay, then you could set it up a little differently. Say you could fund a wing of your library to research ancient tomes and when you gave them enough cash for their research, you got a random account of one of your previous games to read which gave you a bonus, eg, if it was a game where you did well with battles your or troop strength could improve, while if it was a game where you made lots of cash you could get some by finding the locations of ancient treasurevaults.
On the other hand, if it was a game where you slaughtered a certain enemy race, perhaps another race could hear of their grievance and decide to take it up against you.
Just some thoughts.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)