[@Willy Vereb] So, how would you like to go about history between the Sacred and Heavenely Empires?

THINGS THAT I AM CONSIDERING FOR CERESIAN HISTORY:
#1: A gigantic invasion of that old Not!Rome (Old Morovian Empire?) using sea monsters and trident wielding-naga a millenia or three ago, act like a common enemy for all the main civilizations in the past
#2: Some kind of ancient binding treaty that allows the elves to hold those islands in the Ceres Sea. Possibly there was some ancient alliance against a common enemy and the Ceresians gave those islands as a reward. This is probably a better explanation that military concessions since I am already giving concessions to other nations in recent history.
#3: A war against a player in the past that I actually won (Any volunteers?)