So I'm having a role-playing issue about buying lands from the other factions. Usually, when I want some of the lands of another faction but I don't want to go to war against them, I simply send a diplomat to buy the lands. I know it would be cheaper to train an army and just take the settlements by force, but sometimes I use money cheats so this isn't a problem, and also, because of roleplay and personal preferences, I prefer to do it in peaceful ways. But then the question arises: is this realistic? Could such things really happen in Antiquity? I don't want to play in an unrealistic way, so I decided to ask here.