Gog and Magog
In the Syriac Christian legends, Alexander the Great encloses the Gog and Magog horde behind a mighty gate between two mountains, preventing Gog and Magog from invading the Earth. In addition, it is written in the Christian legend that in the end times God will cause the Gate of Gog and Magog to be destroyed, allowing the Gog and Magog horde to ravage the Earth;