First time poster, long time lurker here. Just wanted to chip in with a useful thing I found when playing today. Now I'm only a Prince player, so I don't claim that the following has any viability on the higher difficulties. So it all started when I decided to take Greece for a spin in G&K, and naturally I chose to exploit Alexander's UA. This being G&K, I made an attempt to weave religion into my strategy. That's when I came across the Papal Primacy Founder Belief, which increases the City-State Influence resting point by +15 if your religion is the majority in that City-State. Combined with the Aesthetics policy in the Patronage tree, this pushes the Influence resting point past the friends threshold of 30, hence, perma-friends. This is further enhanced by Alex's UA combined with the Patronage starter which brings the influence decay down to a paltry 0.25 points/turn. To add to that, if they follow your religion, that influence decay is reduced to 0.