Tenrei Ōta (Japanese: 太田 典礼 Ōta Tenrei), born Takeo Ōta (太田 武夫 Ōta Takeo; 1900–1985) was a Japanese obstetrician-gynaecologist and politician. He invented the Ōta ring, an early intrauterine device (IUD). Throughout his life, he was an outspoken advocate for contraception, abortion, and euthanasia. Some of his beliefs were rooted in eugenics, and during his time as a member of Japan's House of Representatives, he drafted and co-sponsored the Eugenic Protection Law.
Source: “Tenrei Ōta”, English Wikipedia (CC BY-SA 4.0), excerpt
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