Press F12 and enter the following codes:
God mode: difrules
Control all troops in God mode: fullcontrol
1,000 additional gold: gold
1,000 additional Piety: piety
1,000 additional Prestige: prestige
All diplomacy successful: byzantine
AI does not declare wars: nowar
Kill selected character: die
Population will not revolt: norevolts
Remove fog of war: nofog
Show country ID: showid