I can almost guarantee you it is. The Wikipedia page is not as fleshed as it's supposed to be, but I was raised on the fear of Yagog & Magog and we're told the only thing stopping them from coming out and massacring us all, is the great wall of China (well, not exactly, the myth was developed under a flat-world, so they're "at the edge" of Earth. Nowadays the apologists just say it's the GWoC to keep intellectual consistency, but we all know it's not. By their description, they sound like "unlearned savages" outside the Caliphate, Siberia, South East Asia, and Scandinavia; since the rest of the old world was by then very well explored.)