Carolusi

I had the exact same problem but got went on "https://redmine.thqnordic.com/issues/115443", Where a person replied that you can go to C:\Users\"username"\AppData\Local\ExpeditionsRome\Saved\SaveGames and delete your save file with the longest playtime. This also works with Ironman mode because Ironman has a "hidden" save used for this very thing.