1955    King Norodom Sihanouk of Cambodia abdicates the throne in favor of his father, King Norodom Suramarit.

1958    A parcel bomb sent by Ngo Dinh Nhu, younger brother and chief adviser of South Vietnamese President Ngo Dinh Diem, fails to kill King Norodom Sihanouk of Cambodia.

1970    Lon Nol ousts Prince Norodom Sihanouk of Cambodia.

1976    Prince Norodom Sihanouk resigns as leader of Cambodia and is placed under house arrest.

1991    Cambodian Prince Norodom Sihanouk returns to Phnom Penh after thirteen years of exile.

2004    King Norodom Sihanouk of Cambodia abdicates.