according to Tibetan Buddhist myth, Gyalpo Pehar is the chief spirit belonging to the gyalpo class. When Padmasambhava arrived in Tibet in the eighth century, he subdued all gyalpo spirits and put them under control of Gyalpo Pehar, who promised not to harm any sentient beings and was made the chief guardian spirit of the Samye Temple built at that time. Some Tibetans believe that the protector of Samye sometimes enters the body of a medium (called the "Dharma Lord of Samye") and acts as an oracle.
This is Pehar, one of the Five Great Kings of body, speech, mind, qualities & activities. Originally guardian at Samye Monastery (Nyingma) and later of Nechung Monastery near Lhasa (Gelug).

Abiding in a blue-green turquoise palace in the lower right or northern corner is the ‘Black and White Pehar, the King of Activity’ (‘phrin-las rgyal-po pe-har dkar-nag), who is also known as the ‘Three-faced high-ranking great one’. He arises from the syllable TRI, and is white in colour with three faces (blue, white, red), three eyes, and six arms. With his three right hands he holds an iron hook, a silken arrow, and a sword. With his three left hands he holds a cane stick, a bow, and a sharp knife or razor. He wears jewel ornaments, an upper garment of white silk, a human-skin shawl, a tiger-skin loincloth, and a parasol-like golden cane or rattan hat that is crowned with a half-vajra. He rides upon a white lion and his principal messenger is a jackdaw. Pehar may also be shown holding a drawn bow and arrow in his second pair of left and right hands.