May 9 (May 9) is the 129th day of the year in the Gregorian calendar (130th in leap years). There are 236 days remaining until the end of the year.
328 - Athanasius the Great is elected Patriarch of Alexandria.
1502 - Spanish navigator Christopher Columbus sails from the Spanish port of Cadiz for his fourth and final voyage to the New World.
1763 - A siege of Fort Detroit begins during Pontiac's war against the British.
1788 - A British parliament abolishes the slave trade.
1877 - Romania declares independence, one month after forming an alliance with Russia against the Ottoman Empire.
1901 - Australia's first parliament opens in Melbourne.
1911 - A group of officers, participants in the May coup and assassination of King Aleksandar Obrenović in 1903, founded the secret organization "Unification or Death", or "Black Hand", in Belgrade.
1926 - Americans Richard Byrd and Floyd Bennett first fly over the North Pole.
1927 - Canberra becomes the capital of Australia instead of Melbourne.
1936 - Italy officially occupies Abyssinia, now Ethiopia, and proclaims Italian King Vittorio Emanuel III emperor of Abyssinia.
1945 - Final defeat of Germany, conquest of Berlin by the Soviets. Guernsey Island liberated from Nazi German occupation.
1946 - Italian King Vittorio Emanuele III abdicates and is succeeded by his son Umberto II.
1948 - The Communist Party of Yugoslavia rejects accusations by Soviet communists against the policies of the Yugoslav leadership. This was followed by an Informbiro resolution and years of political and economic pressure from the Soviet bloc on Yugoslavia.
1950 - French Foreign Minister Robert Schuman calls for reconciliation between France and Germany and proposes the creation of a Coal and Steel Community, the forerunner of the European Union.
1952 - Mass protests are held throughout Yugoslavia over the London Agreement, in which Zone "A" of the Free Territory of Trieste belongs to Italy.
1955 - West Germany becomes a member of NATO.
1960 - The United States becomes the first country to legalize birth control pills.
1976 - Ulrike Meinhof, leader of the West German terrorist group Bader-Meinhof, hangs herself in a prison cell.
1978 - The body of former Italian Prime Minister Aldo Moro, abducted by Red Brigade terrorists 54 days earlier, is found in a parked car in central Rome.