Ishiyama Hongan-ji
As a consequence of the Ikkō-ikki revolts and the growing power of the Jōdo Shinshū, the sect's fortress-temples Ishiyama Hongan-ji and Nagashima (built at the end of the 15th century) were eventually destroyed by Oda Nobunaga's armies. The fortress at Nagashima was razed to the ground in 1574, taking about 20,000 people with it. The Ishiyama Hongan-ji withstood the longest siege in Japanese history, before surrendering in 1580. Upon its ruins, Toyotomi Hideyoshi built Osaka Castle, a replica of which stands on the site today. Following the destruction of Nagashima, Nobunaga ordered his men to search all of Echizen Province and kill every last man and woman of the so-called Ikkō sect. Other Ikkō-shū Buddhists went underground, forming the "kakure nenbutsu".