In Japan, it began from Eisei who introduced Rinzai Zen from China, and it has many schools because some masters introduced Shingi (daily regulations in Zen temples) of each age from China to Japan.
日本では中国から臨済禅を伝えた栄西に始まり、その後何人かの祖師たちが中国からそれぞれの時代の清規を日本に伝えたため分派は多い。