I always have a hard time dealing with this, and don't really know how to take it. I realize that giving someone tribute gives you good relations with that civ, but sometimes it just gets excessive, and they ask me for favors constantly. However, if I am already friendly with a civ, is there really any point in giving them tribute any further? Also, at what point can I ask for tribute? I can never convince the AI to give me squat, which is kind of unfair because you think they'd also consider the consequences of not doing so and being on bad terms with me. However as soon as I say no to something to an AI Civ they hate my guts and won't have anything to do with me, especially if they don't share my religion.