Era of Fragmentation

The Era of Fragmentation (Tibetan: སིལ་བའི་དུས།) was an era of disunity in Tibetan history lasting from the death of the Tibetan Empire's last king, Langdarma, in 842 until Drogön Chögyal Phagpa became the Imperial Preceptor of the three regions of Tibet in 1253, following the Mongol conquest in the 1240s. During this period, the political unity of the Tibetan Empire collapsed following the Battle of U-Yor between Yumtän (Yum brtan) and Ösung (’Od-srung), after which followed numerous rebellions against the remnants of the empire and the rise of regional warlords.