Hon'inbō Sansa

Hon'inbō Sansa was a Japanese Buddhist monk and go player active in the late 16th and early 17th centuries, traditionally regarded as founder of the Hon'inbō school.

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Tokugawa Ieyasu: The founder of the Tokugawa shogunate, which ruled Japan from 1603 to 1868. His government established official support for professional go, including Sansa’s position.
Honnō-ji: A Buddhist temple in Kyoto, historically associated with the Nichiren school. Sansa was a monk at Honnō-ji before his go career brought him to political attention.
Hon'inbō school: A hereditary Japanese go school founded by Hon'inbō Sansa and active during the Edo period. Sansa’s name became the school’s title, linking his personal authority to a lasting institution.
Hon'inbō Shūsaku: A 19th-century Japanese go master widely regarded as one of the game’s greatest players. Shūsaku became the Hon'inbō school’s most celebrated later player, extending its prestige.
Oda Nobunaga: A Japanese warlord who sought to unify Japan in the late 16th century. Nobunaga’s patronage helped bring Sansa to prominence at the start of his public career.
Nichiren Buddhism: A Japanese Buddhist tradition based on the teachings of the medieval monk Nichiren. Sansa’s monastic affiliation places his early life within this Buddhist tradition.
Meijin: A Japanese title meaning master, historically awarded to leading go players. Sansa was recognized as a meijin, a status that helped establish professional go’s hierarchy.
Go Seigen: A Chinese-born go master who reshaped modern professional play in the 20th century. His modern career contrasts with the hereditary school system associated with Sansa’s era.
Toyotomi Hideyoshi: A Japanese military and political leader who completed the unification of Japan in the late 16th century. Hideyoshi sponsored go contests in which Sansa’s skill gained official notice.
Tokugawa shogunate: The military government that ruled Japan from 1603 to 1868 under the Tokugawa family. Its patronage transformed go from a courtly pursuit into an organized profession.