In my story, each land of the world has 2 names. Each land is called one name by a small tribe, and another name by the empire that rules over them. I will explain this at the beginning, but I'm still in a quandry over which names to use during the main body of the story. The story is told through the eyes of the small tribe, so they use their own names for the countries amongst themselves. However, they travel through the other lands and interact with people of the empire, and at those times they must call places by the names the empire use. Just as an example of what I mean, the situation in my story is similar to when Britain was occupied by the Romans. The Romans called Britain Britannica, but the native British people called it Albonium. So, do you think the reader would be confused or annoyed if my characters call places by their native names amongst themselves, but call them by their "official" names whilst travelling? Or do you think I could put both names, eg: "And so they journeyed on to Albonium/Britannica"?