Zen is a school.
 These schools are further divided into subschools by head temple, with two head temples for St (Sji-ji and Eihei-ji, with Sji-ji having a much larger network), fourteen head temples for Rinzai, and one head temple (Manpuku-ji) for baku, for a total of 17 head temples
 At the beginning of the Tang Dynasty, by the time of the Fifth Patriarch Hongren (601674), the Zen school became established as a separate school of Buddhism

