9th century in Tibet

period of Tibetan history (9th–11th centuries CE) during which the political centralization of the Tibetan Empire collapsed following a civil war between Yumtän (Yum brtan) and Ösung (’Od-srung)

The Mahāvyutpatti (Devanagari: महाव्युत्पत्ति, compound of महत् (in compounds often महा) - great, big, and व्युत्पत्ति f. - science, formation of words, etymology; Wylie: Bye-brag-tu rtogs-par byed-pa chen-po), The Great Volume of Precise Understanding or Essential Etymology, was compiled in Tibet during the late eighth to early ninth centuries CE, providing a dictionary composed of thousands of Sanskrit and Tibetan terms designed as means to provide standardised Buddhist texts in Tibetan, and is included as part of the Tibetan Tengyur (Toh. 4346). It is the earliest substantial bilingual dict

peace treaty signed between Tri Ralpachen, Emperor of the Tibet Empire (629 - 877), and Emperor Tang Muzong of the Tang Dynasty of China in 822