Gives a permanent loyalty buff to the capital city, preventing them from revolting, similar to the Statue of Liberty wonder, but only affecting cities with a Palace building. Works for human players, AI and city-states.
Extract the zip file into your Mods folder and enable through in-game menu.
Alternatively, this mod can be found on Steam:
Loyal Capitals 1.2
Palaces give a permanent loyalty buff to all capital cities, preventing them from revolting.