In 821/822 CE Tibet and China signed a peace treaty. A bilingual account of this treaty, including details of the borders between the two countries, is inscribed on a stone pillar which stands outside the Jokhang temple in Lhasa. Tibet continued as a Central Asian empire until the mid-9th century, when a civil war over succession led to the collapse of imperial Tibet. The period that followed is known traditionally as the <answer>Era of Fragmentation</answer>, when political control over Tibet became divided between regional warlords and tribes with no dominant centralized authority.
What followed the collapse of imperial Tibet?
Era of Fragmentation