Ōbaku no Sanpitsu is a name given to a group of three famous Chinese calligraphers who lived in Japan: Ingen Ryūki, 隱元隆琦 1592–1673 Mokuan Shōtō,木庵性瑫 1611–1684 Sokuhi Nyoitsu, 即非如一 1616–1671They are all connected with the Ōbaku school of Zen Buddhism. Wikipedia