11th Panchen Lama controversy
The 11th Panchen Lama controversy centers on the 30-year-long enforced disappearance of Gedhun Choekyi Nyima, and on the recognition of the 11th Panchen Lama. The Panchen Lama is considered the second most important spiritual leader in Tibetan Buddhism after the Dalai Lama.
Source: Wikipedia — 11th Panchen Lama controversy (CC BY-SA 4.0)