Although a number of breakaway schools rose during the Kamakura period, the Tendai school used its patronage to try to oppose the growth of these rival factions—particularly Nichiren Buddhism, which began to grow in power among the merchant middle class, and Pure Land Buddhism, which eventually came to claim the loyalty of many of the poorer classes. Enryaku-ji, the temple complex on Mount Hiei, became a sprawling center of power, attended not only by ascetic monks, but also by brigades of sōhei who fought in the temple's interest. As a result, in 1571 Enryaku-ji was razed by Oda Nobunaga as part of his campaign to unify Japan. Nobunaga regarded the Mount Hiei monks as a potential threat or rival, as they could employ religious claims to attempt to rally the populace to their side. The temple complex was later rebuilt, and continues to serve as the head Tendai temple today.