Dhu al-Qarnayn, (Arabic: ذُو ٱلْقَرْنَيْن], lit.: "He of the Two Horns"), also spelled Zu al-Qarnayn, appears in the Quran, Surah Al-Kahf (18), Ayahs 83-101 as one who travels to east and west and erects a wall between mankind and Gog and Magog (called Ya'juj and Ma'juj). Elsewhere the Quran tells how the end of the world would be signaled by the release of Gog and Magog from behind the wall, and other apocalyptic writings report their destruction by God in a single night would usher in the Day of Resurrection (Yawm al-Qiyāmah). Early Muslim commentators and historians assimilated Dhu al-Qarnayn to several figures, among them Alexander the Great, the Parthian king Kisrounis, the South-Arabian Himyarite king Sa'b Dhu Marathid, and the North-Arabian Lakhmid king al-Mundhir ibn Imru al-Qays. Some have argued that the origins of the Quranic story lies in the Syriac Alexander Legend, but others disagree citing dating inconsistencies and missing key elements.