応天門の変
おうてんもんのへん
Ōtenmon incident (conspiracy in 866 CE that centered on the destruction of the main gate of the Imperial Palace)
応変 is read as おうへん (ouhen) and means appropriate (urgent) response.
おうへん
ouhen
おうてんもんのへん
Ōtenmon incident (conspiracy in 866 CE that centered on the destruction of the main gate of the Imperial Palace)