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 Era of Fragmentation, when <answer>political control over Tibet</answer> became divided between regional warlords and tribes with no dominant centralized authority.
What was divided between warlords and tribes with no dominant centralized authority?
political control over Tibet