Loyalty is referred to in the modifiers as both "identity" and "loyalty." Here are some of the ModifierTypes I know about from database scans:
- MODIFIER_PLAYER_CITIES_ADJUST_IDENTITY_PER_TURN
- MODIFIER_PLAYER_GOVERNORS_ADJUST_IDENTITY_PER_TITLE
- MODIFIER_PLAYER_ADJUST_PLAYER_IDENTITY_PER_TURN_FOR_DOMESTIC_TRADE_ROUTE_ORIGIN
- MODIFIER_PLAYER_CITIES_ADJUST_IDENTITY_PER_CITIZEN
- MODIFIER_GOVERNOR_ADJUST_GOVERNOR_IDENTITY_PRESSURE
- MODIFIER_PLAYER_CITIES_ADJUST_IDENTITY_PRESSURE_FROM_EMERGENCIES
- MODIFIER_SINGLE_CITY_ADJUST_IDENTITY_PER_TURN
- MODIFIER_PLAYER_CITIES_ADJUST_ALWAYS_LOYAL
- MODIFIER_SINGLE_CITY_GRANT_LOYALTY
- MODIFIER_PLAYER_ADJUST_POST_COMBAT_LOYALTY
- MODIFIER_PLAYER_LOYALTY_ADJUST_MARTIAL_LAW_MODIFIER