Wikipedia
Tatsag
The Tatsag or Tatsak (Wylie: rTa-tshag) lineage is a Tibetan Buddhist reincarnation lineage whose first member was Baso Chokyi Gyaltsen (1402–73). Since 1794 the Tatsag has been the owner of the Kundeling Monastery in Lhasa. There has been some controversy over the representative of the lineage in recent years.