The Old Book of Tang say that the southern tributaries of the empire revolted and during the imperial military reaction, Tridu Songtsen was killed.
[1] Tibetan Annals from Dunhuang briefly mention that an older brother of Me Agtsom was deposed in 705.
[2] On the basis of these materials the historian Christopher Beckwith argues that Me Agtsom did not succeed his father immediately.
After a short while, his powerful grandmother, the empress dowager Khri ma lod, dethroned him and placed the infant Gyal Tsugru - the future Me Agtsom - on the throne.
The coup was accompanied by revolts and executions involving the vassal country Serib at the south-western border of Tibet.