Vajrapāni is one of the earliest Dharmapalas of Mahayana Buddhism and also appears as a deity in the Pali Canon of the Theravada school. He is worshiped in the Shaolin Monastery, in Tibetan Buddhism and in Pure Land Buddhism (where he is known as Mahasthamaprapta and forms a triad with Amitābha and Avalokiteśvara). Manifestations of Vajrapāni can also be found in many Buddhist temples in Japan as Dharma protectors called Nio. Vajrapāni is also associated with Acala, who is venerated as "Fudō-Myōō" in Japan, where he is serenaded as the holder of the vajra.