Religious Unity applying to Friendly or Allied City-States?

Frossa

Prince
Joined
Apr 29, 2012
Messages
413
Location
Sweden
Does the Religious Unity Belief (Religion spreads to friendly city-states at double rate) apply to Friendly or Allied City-States? The game uses 'friendly' quite interchangeably most of the time, so it's hard to tell what it actually means.
 
Top Bottom