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Oda Nagamasu (?? ???, 1548 – January 24, 1622) was a Japanese daimyo who lived from the late Sengoku period through the early Edo period. Also known as Urakusai (???), he was a brother of Oda Nobunaga. Nagamasu converted to Christianity in 1588 and took the baptismal name of John. Nagamasu was an accomplished practitioner of the tea ceremony, which he studied under the master, Sen no Rikyu. He eventually started his own school of the tea ceremony.