Yosano Tekkan was a prominent Japanese poet and critic, born in 1873 and passing away in 1939. He is best known for his contributions to the tanka poetry form, which consists of five lines with a 5-7-5-7-7 syllable structure. Tekkan played a significant role in the modern development of this traditional style, blending classical themes with contemporary issues. In addition to his poetry, Tekkan was a key figure in the Shinkankakuha movement, which sought to innovate and revitalize Japanese literature. He was also the husband of Yosano Akiko, a celebrated poet in her own right, and together they influenced the literary landscape of early 20th-century Japan.