The Tainei-ji incident was a coup in September 1551 by Sue Takafusa against Ōuchi Yoshitaka, hegemon daimyō of western Japan, which ended in the latter's forced suicide in Tainei-ji, a temple in Nagato Province. The coup put an abrupt end to the prosperity of the Ōuchi clan, though they ruled western Japan in name for another six years under the figurehead Ōuchi Yoshinaga, who was not related to the Ōuchi by blood.

Emperor Go-Nara was the 105th Emperor of Japan, according to the traditional order of succession. He reigned from June 9, 1526, until his death in 1557, during the Sengoku period. His personal name was Tomohito (知仁).