The Secret History of the Mongols is a chronicle written in the 13th century CE (with some later additions) and is the most important and oldest medieval Mongolian text. The book covers the origins of the Mongol people, the rise to power and reign of Genghis Khan  (r. 1206-1227 CE) and the reign of his son and successor Ogedei Khan (r. 1229-1241 CE). Written from a Mongolian perspective, unlike most other medieval sources on the Mongol Empire, the work is an invaluable record