Lit.: "One-minded School/Sect", a small, militant, antinomian offshoot of True Pure Land Buddhism founded by 13th-century monk Ikkou Shunjou. Its ideologies provided the basis for a wave of uprisings against feudal rule in the late 15th and 16th centuries, such as the Ikkou-ikki revolts. Oda Nobunaga eventually destroyed the sect's two large temple-fortresses, Nagashima and Ishiyama Hongan Temple and slaughtered most of its sectarians in those areas. Tokugawa Ieyasu defeated the followers of the sect in Mikawa in 1564 in the Battle of Azukizaka. The last of the Ikkou sect fought alongside Toyotomi Hideyoshi in the 1580s.