Shunsui Tamenaga (為永 春水, 1790-11 February 1844) was the pen name of Sadataka Sasaki (佐々木 貞高), a Japanese novelist of the Edo period. In Japan, he is best known for his romantic novel Shunshoku umegoyomi, or "Signs of Spring: A Plum-Blossom Almanac". He followed up to this with sequels and his son, who called himself Shunsui Tamenaga Junior, continued the series. In Japan, he is considered a major writer of the Edo period, remembered for disobeying the Tenpou reforms . He also wrote a version of the Chushingura called "Iroha Bunko". In Western literature, he is probably better known for his humorous story Longetivity, which was translated by Yei Theodora Ozaki for her book Japanese Fairy Tales in 1908, and since then has been reprinted in some children's Asian fairy tale collections.

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• The 47 Rônin are Introduced to the World