وهب بن منبه
In various accounts al-Khidr has been linked to the figure of Dhu al-Qarnayn, who is either identified as Cyrus the Great or the Himyarite King Ṣaʿb. In one version, al-Khiḍr and Dhul-Qarnayn cross the Land of Darkness to find the Water of Life. Dhul-Qarnayn gets lost looking for the spring but al-Khiḍr finds it and gains eternal life. According to Wahb ibn Munabbih, quoted by Ibn Hisham, King Ṣaʿb was given the epithet Dhu al-Qarnayn by al-Khidr after meeting him in Jerusalem. There are also several versions of the Alexander Romance in which al-Khiḍr figures as a servant of Alexander the Great. In the "Eskandarnāma" by an anonymous author, al-Khiḍr is asked by Dhul-Qarnayn to lead him and his armies to the Water of Life. Al-Khiḍr agrees, and eventually stumbles upon the Water of Life on his own.