Yamaguchi Seishi Yamaguchi Seishi (山口誓子; November 3, 1901 – March 26, 1994) was a Japanese haiku poet. He was born on November 3, 1901, in Kyoto. His father, an electrical engineer, took him at age eleven to Karafuto Prefecture on Sakhalin Island, where his grandfather ran a newspaper press. Yamaguchi left Karafuto permanently in 1917, but the desolate winter landscape there would feature often in his poetry. He attended the Third Hig…