The earliest surviving Arabic narrative of the Alexander romance was composed by Umara ibn Zayd (767–815 AD). In the tale, Alexander travels a great deal, builds the Wall against Gog and Magog, searches for the Water of Life (Fountain of Youth), and encounters angels who give him a "wonder-stone" that both weighs more than any other stone but is also as light as dust. This wonder-stone is meant to admonish Alexander for his ambitions and indicate that his lust for conquest and eternal life will not end until his death. The story of the wonder-stone is not found in the Syriac Christian legend, but is found in Jewish Talmudic traditions about Alexander as well as in Persian traditions.