Buddhist monks from Kyoto, Japan's Enryaku-ji temple set fire to 21 Nichiren temples throughout Kyoto in what will be known as the Tenbun Hokke Disturbance.

Kyoto, officially Kyoto City , is the capital city of Kyoto Prefecture in the Kansai region of Japan's largest and most populous island of Honshu. As of 2020, the city had a population of 1.46 million, making it the ninth-most populous city in Japan. More than half (56.8%) of Kyoto Prefecture's population resides in the city. The city is the cultural anchor of the substantially larger Greater Kyoto, a metropolitan statistical area (MSA) home to a census-estimated 3.8 million people. It is also part of the even larger Keihanshin metropolitan area, along with Osaka and Kobe.

Enryaku-ji is a Tendai monastery located on Mount Hiei in Ōtsu, overlooking Kyoto. It was first founded in 788 during the early Heian period (794–1185) by Saichō (767–822), also known as Dengyō Daishi, who introduced the Tendai sect of Mahayana Buddhism to Japan from China. The temple complex has undergone several reconstruction efforts since then, with the most significant taking place in 1642 under Tokugawa Iemitsu. Enryaku-ji is the headquarters of the Tendai sect and one of the most significant monasteries in Japanese history. As such, it is part of the UNESCO World Heritage Site "Historic Monuments of Ancient Kyoto ". The founders of Jōdo-shū, Jōdo Shinshū, Sōtō Zen, and Nichiren Buddhism all spent time at the monastery. Enryaku-ji is also the center for the practice of kaihōgyō.

Nichiren Buddhism, also known as Hokkeshū, is a branch of Mahayana Buddhism based on the teachings of the 13th-century Japanese Buddhist priest Nichiren (1222–1282) and is one of the Kamakura period schools. Its teachings derive from some 300–400 extant letters and treatises either authored by or attributed to Nichiren.