Name: Ikkyu (一休 いっきゅう)
Biography: Ikkyu was a Buddhist priest during the Muromachi period in Japanese history. Ikkyu was a poet and calligrapher, and he is credited with contributing to the tradition of the tea ceremony. He is also remembered as a mischievous boy (as shown in the animated TV series “Ikkyu-san”) and a bit of a libertine.
Further reading Wikipedia (English), Wikipedia (日本語).