The history of Buddhism in Japan can be roughly divided into three periods, namely the Nara period (710 - 794), the Heian period (794–1185) and the post-Heian period (1185 onwards). Each period saw the introduction of new doctrines and upheavals in existing schools. See Sōhei (warrior monks). In modern times, the main paths of Buddhism are Amidist (Pure Land) schools, Nichiren Buddhism, Shingon Buddhism and Zen Buddhism. The root of the Japanese word for Buddhism, bukkyō(仏教) comes from 仏 (butsu, “buddha”) + 教 (kyō, “teaching”).