I wouldn't usually post a wikipedia entry, but seeing wikipedia don't mind editing page entry's on a whim... this entry is quite fascinating regarding *Celestial Beings*.

Dagchen Rinpoche’s family lineage is considered divine because family records and Tibetan histories state that his family is descended from celestial beings from the realm of heavenly clear light. Five generations of these celestial beings are said to have lived in Tibet. A famous ancestor of his from the late eighth century was Khön Lu’i Wangpo (Nagendrarak#a), one of the first seven Tibetans ordained as a Buddhist monk, a noted translator, and a personal disciple of Padmasambhava (who erected the very first Tibetan Buddhist monastery called Samye). Since the 11th century, the Sakya male progenies are also regarded as emanations of Manjushri, the Bodhisattva of Wisdom; Avalokiteshvara Bodhisattva of Compassion; or Vajrapani, Bodhisattva of Power.