As the title says, how do give away cities? I've played a lot of games of Vanilla, RTR and EB and nobody ever wants one of my cities, except by violence.

Most recently I took Ameasia (sp?) from the Selukids and offered it to Pontus (stuck in Sinope). But they didn't want it, said I'd just take it back.

If this was just hard-coded AI stupidity, I'd accept it. But others of you seem to do it regularly. How?