You are an American who just got your alternative potential answer from Wikipedia, right? Decent rapid research skills, well done.
But you need to keep going to contextual information. "the Historic City of London" is what it says on the page you linked, but click on "City of London" for its definition, perhaps.
And if you're doing a bit like other posters, you need to keep the format roughly the same to convey that metatextual information.