1492 - Christopher Columbus signed a contract with Spain to find a passage to Asia and the Indies.
1521 - Martin Luther was excommunicated from the Roman Catholic Church.
1524 - New York Harbor was discovered by Giovanni Verrazano.
1865 - Mary Surratt was arrested as a conspirator in the Lincoln assassination.
1875 - The game "snooker" was invented by Sir Neville Chamberlain.
1946 - The last French troops left Syria.
1964 - Jerrie Mock became first woman to fly an airplane solo around the world.
1970 - Apollo 13 returned to Earth safely after an on-board accident with an oxygen tank.
1975 - Khmer Rouge forces capture the capital of Cambodia, Phnom Penh. It was the end of the five-year war.
1984 - In London, gunmen from the Libyan Embassy fired into an anti-Libya protest. One policewoman was killed and 10 others were wounded.
1989 - In Poland, courts gave Solidarity legal status.