The story of Dhul-Qarnayn (in Arabic ذو القرنين, literally "The Two-Horned One", also transliterated as Zul-Qarnain or Zulqarnain), mentioned in the Quran, may be a reference to Alexander III of Macedon (356–323 BC), popularly known as Alexander the Great.
Dhul-Qarnayn was a well-known figure in the lore of the ancient dwellers of the Arabian Peninsula. The majority of traditional and modern scholars have generally endorsed the identification of Dhul-Qarnayn with Alexander the Great, but some early Muslim scholars saw it as a reference to a pre-Islamic monarch from Persia or south Arabia. It has also been a matter of theological controversy amongst Muslim scholars since early times. In more recent times, some Muslim scholars have suggested other alternatives, for example that Dhul-Qarnayn may be Cyrus the Great instead of Alexander the Great. There have been many different cultural depictions of Alexander the Great since antiquity. Similarities between the Quran and the Alexander romance were also identified in recent research based on the translation of certain medieval Syriac manuscripts.
There have been many different cultural depictions of Alexander the Great since antiquity, including references in the Hebrew Bible in 1 Maccabees and the Book of Daniel. Alexander the Great was an immensely popular figure in the classical and post-classical cultures of the Mediterranean and Middle East. Almost immediately after his death in 323 BC a body of legend began to accumulate about his exploits and life which, over the centuries, became increasingly fantastic as well as allegorical. Collectively this tradition is called the Alexander romance and some recensions feature such vivid episodes as Alexander ascending through the air to Paradise, journeying to the bottom of the sea in a glass bubble, and journeying through the Land of Darkness in search of the Water of Life (Fountain of Youth).