Which Buddhist Monk was sent by Dalai Lama to resolve the family disputes of Namgyal dynasty rulers?

After Nyima's death, anarchy prevailed in Ladakh. His sons Deskyong Namgyal and Tashi Namgyal fought for the throne. Ladakh was divided into two parts. Family fights continued to weaken the Namgyal dynasty. At this time, Dalai Lama sent his emissary, Rigzin Tsewang Norbu to resolve the family issues of Namgyal dynasty.