What is "tagtsepa"

Tagtsepa Lhagyal Rabten (died 1720) was the regent of the Tibetan administration during the 3-year rule of the Dzungar Khanate in Tibet (1717-1720). He carried the Tibetan title sakyong (sa-skyong, "protector of the earth"). After the intervention by the troops of the Chinese Kangxi Emperor, he was executed by the Chinese on the charge of collaboration, thus began the period of Qing rule of Tibet.