Aryadeva
3rd century Sri Lankan philosopher and writer
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Through Sri Lanka, Nalanda mahavihara and Bihar
Āryadeva's writings are important sources of Madhyamaka in East Asian Buddhism. His Catuḥśataka (Four Hundred Verses) was influential on Madhyamaka in India and China and his *Śataka (Bailun, 百論, T. 1569) and Dvādaśamukhaśāstra (both translated by Kumārajīva in the 4th century) were important sources for the East Asian Madhyamaka school. Āryadeva is also known as Kanadeva, recognized as the 15th patriarch in Chan/Zen Buddhism and some Sinhalese sources also mention an elder (thera) called Deva which may also be the same person. He is known for his association with the Nalanda monastery in modern-day Bihar, India.
Biography
The earliest biographical sources on Aryadeva state that he was a Buddhist monk who became a student of Nagarjuna and was skilled in debate.
According to Karen Lang:
The earliest information we have about the life of Aryadeva occurs in the hagiography translated into Chinese by the Central Asian monk Kumarajiva (344–413 c.e.). It tells us that he was born into a Brahmin family in south India and became the spiritual son of Nagarjuna. Aryadeva became so skilled in debate that he could defeat all his opponents and convert them to Buddhism. One defeated teacher’s student sought him out and murdered him in the forest where he had retired to write. The dying Aryadeva forgave him and converted him to Buddhism with an eloquent discourse on suffering.
Lang also discusses Xuanzang's (7th century) writings which mention Aryadeva:
He reports that Aryadeva came to south India from the island of Simhala because of his compassion for the ignorant people of India. He met the aging Nagarjuna at his residence on Black Bee Mountain, located southwest of the Satavahana capital, and became his most gifted student. Nagarjuna helped Aryadeva prepare for debate against Brahmanical teachers who had defeated Buddhist monks in the northeastern city of Vaisali for the previous twelve years. Aryadeva went to Vaisali and defeated all his opponents in less than an hour.
Tom Tillemans also notes that Aryadeva's origins in Siṃhaladvīpa (Sri Lanka) are supported by his commentator Candrakīrti (sixth century C.E.), and "may possibly be confirmed by references in the Ceylonese chronicles Dīpavaṃsa and Mahāvaṃsa to a “Deva” who lived in the second half of the third century at the time when the Indian Vetullavāda sect of Great Vehicle Buddhism was temporarily implanted in Śrī Laṅka."
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The Tantric Āryadeva
Several important works of esoteric Buddhism (most notably the Caryamelapakapradipa or "Lamp that Integrates the Practices" and the Jñanasarasamuccaya) are attributed to Āryadeva. Contemporary research suggests that these works are datable to a significantly later period in Buddhist history (late ninth or early tenth century) and they are seen as being part of a Vajrayana Madhyamaka tradition which included a later tantric author also named Āryadeva. Tillemans also notes that the Compendium on the Essence of Knowledge (jñānasārasamuccaya) "gives the fourfold presentation of Buddhist doctrine typical of the doxographical (siddhānta) literature, a genre which considerably post-dates the third century".
Traditional historians (for example, the 17th century Tibetan Tāranātha), aware of the chronological difficulties involved, account for the anachronism via a variety of theories, such as the propagation of later writings via mystical revelation. A useful summary of this tradition, its literature, and historiography may be found in Wedemeyer 2007.

