We are planning to do a fair bit more of these diaries explaining the many details in the game, so I thought I would reorganise them into an archive thread.
The latest diary will always be pinned to the top on its own, but the previous ones will be listed here, so as to not clutter our precious pinned threads:
Developer Diary #1 - The Overview
Developer Diary #2 - Regions, Population, Loyalty
Developer Diary #3 - Buildings
Developer Diary #4 - Commerce and Trading
Dev Diary #5 - Governments and Rulers
Dev Diary #6 - Culture and Decadence
Dev Diary #7 - Provinces
Dev Diary #8 - Legacy
Dev Diary #9 - Battle System