Ahmad ibn Fadlan

Ahmad ibn Fadlan traveled from Baghdad as part of an embassy sent by Abbasid caliph al-Muqtadir to the king of the Volga Bulgars. Along the way he moved with trade caravans and encountered peoples the Islamic world barely knew: Volga Vikings, Oghuz Turks, Khazars, Cumans, Pechenegs. He watched, noted, and wrote it all down in his risāla. The account survives as an irreplaceable record of cultures at a hinge moment, cited by historians ever since. Centuries later it jumped genres: Michael Crichton borrowed his journey for Eaters of the Dead, which became the film The 13th Warrior.