Somdet Phra Ariyavangsagatayana Somdet Phra Sangharaja known also as Ariyavangsagatayana was the 16th Supreme Patriarch of Thailand 1965–1971 (2508–2514 Thai calendar). He was born in 1897 as Juan Sirisom in the Rajburi province. He was a member of the Makutkrasattriyaram Temple. He died in 1971. His predecessor was Ariyavangsagatayana 15th Supreme Patriarch of Thailand and his successor was Ariyavangsagatayana 17th Supreme Patriarch of Thailand.