 Following the Muslim conquest, the river appears in the sources uniformly as the "Seyhun" (سيحون), one of the four rivers flowing from the Paradise (Jannah in Arabic).The current local name of the river, "Syr" ("Sïr"), does not appear before the 16th century.In the 17th century, Abu al-Ghazi Bahadur Khan, historian and ruler of Khiva, called the Aral Sea the "Sea of Sïr," or "Sïr Tengizi".