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)
蛤御門の変 is read as はまぐりごもんのへん (hamagurigomon no hen) and means Hamaguri Gomon incident (1864 clash between pro and anti-shogunate forces).
はまぐりごもんのへん
hamagurigomon no hen