1572: Pope Pius V dies at the age of 68 in Rome, Papal States. Born Antonio Ghislieri, he was canonized as a saint of the Roman Catholic Church in 1712.
1707: The Acts of Union join the Kingdom of England and Kingdom of Scotland to form the Kingdom of Great Britain. Pictured is the first Union flag, created to symbolize the union.
1776: The Bavarian Illuminati is established by Jesuit-taught Adam Weishaupt. The secret society opposed superstition, prejudice, religious influence over public life, and abuses of state power, and supported women's education and gender equality. The Illuminati were outlawed along with other secret societies by the Bavarian government leadership with the encouragement of the Roman Catholic Church, and permanently disbanded in 1785.
1786: Wolfgang Amadeus Mozart's opera "The Marriage of Figaro" premieres in Vienna, Austria.
1840: The Penny Black, the first official adhesive postage stamp, is issued in London, England.
1851: Queen Victoria opens the Great Exhibition inside the Crystal Palace in London's Hyde Park. The event was the first in a series of World's Fair exhibitions of culture and industry that became popular for the next century.
1852: Frontierswoman and professional scout Calamity Jane, best known for her claim of being an acquaintance of Wild Bill Hickok, is born Martha Jane Canary in Princeton, Mo.
1864: Anna Jarvis, the founder of Mother's Day in the United States, is born in Webster, W.Va.
1873: David Livingstone, the Scottish missionary and explorer of Africa whose 1871 meeting with Welsh-American journalist and explorer H. M. Stanley gave rise to the popular quotation "Dr. Livingstone, I presume?," dies at the age of 60 in North-Eastern Rhodesia from malaria and internal bleeding caused by dysentery.
1883: William "Buffalo Bill" Cody stages his first Wild West show for an invitation-only audience. The show was a hit, with its first public performance taking place in Omaha, Neb., on May 19. The circus-like attraction toured annually through 1908.
1884: Moses Fleetwood Walker becomes the first black person to play in a major-league baseball game in the United States, going hitless with four errors for the Toledo Blue Stockings against the Louisville Eclipse. Walker joined the then-minor-league Blue Stockings in 1883 as a catcher and the team joined the major-league American Association for the 1884 season. Walker's suffered a season-ending surgery in July and the team folded at the end of the season. He returned to the minor-leagues and never played another game in the majors.
1893: The World's Columbian Exposition opens in Chicago, Ill. The fair, held to celebrate the 400th anniversary of Christopher Columbus' arrival in the New World in 1492, featured mostly temporary buildings designed by Daniel Burnham and Frederick Law Olmsted in a French neoclassical style surrounding a large pond of water in Jackson Park. Nicknamed the "White City" for the white stucco exteriors of the buildings, the fairgrounds hosted pavilions from 46 nations and drew nearly 26 million visitors before closing on Oct. 30, 1893.
1898: The United States Navy under Commodore George Dewey destroys the Spanish Pacific Squadron in the Battle of Manila Bay, the first battle of the Spanish-American War.
1899: Bayer introduces aspirin in powder form in Germany. It was later introduced in tablet form in January 1915.
1901: The Pan-American Exposition opens in Buffalo, N.Y. The world's fair, which ran through Nov. 2, 1901, is most remembered because U.S. President William McKinley was assassinated by anarchist Leon Czolgosz at the exposition's Temple of Music on Sept. 6, 1901. McKinley, who died eight days later, had given an address at the expo the previous day.
1918: Comedian and talk show host Jack Paar, best known for his stint as host of "The Tonight Show" from 1957 to 1962, is born in Canton, Ohio.
1923: Novelist Joseph Heller, best known for his satirical novel "Catch-22," is born in Brooklyn, N.Y. Heller is seen here in 1986.
1925: Scott Carpenter, one of the original seven astronauts selected for NASA's Project Mercury in April 1959, is born in Boulder, Colo. Carpenter was the second American to orbit the Earth and the fourth American in space, following Alan Shepard, Gus Grissom and John Glenn.
1927: The first cooked meals on a scheduled flight are introduced on an Imperial Airways flight from London to Paris.
1931: The Empire State Building opens in New York City when U.S. President Herbert Hoover turns on the building's lights with the push of a button from Washington, D.C. The 102-story skyscraper would remain the tallest building in the world until construction of the World Trade Center's North Tower was completed in 1972.
1939: Singer-songwriter Judy Collins, best known for hit covers of songs such as "Amazing Grace," "Send in the Clowns" and "Both Sides, Now," is born in Seattle, Wash.
1941: The drama "Citizen Kane," starring and directed by Orson Welles in his first feature film, premieres in theaters. The movie, which examines the life and legacy of Charles Foster Kane, played by Welles, a character based in part upon the American newspaper magnate William Randolph Hearst, is often considered by critics, filmmakers and fans to be the greatest film ever made. It would go on to earn Academy Award nominations in nine categories, including Best Picture and Best Actor for Welles, but would win only for its screenplay.
1941: General Mills introduces the breakfast cereal Cheerios, originally known as CherriOats. The name was changed to Cheerios in 1945 because of a trade name dispute with Quaker Oats.
1945: Reich propaganda minister Joseph Goebbels and his wife Magda commit suicide in the Reich Garden outside the bunker in which Adolf Hitler and Eva Braun had killed themselves a day earlier. Before killing himself, Goebbels had ordered the murder of his six children, with a dentist injecting them with morphine and Magda and Hitler's personal doctor crushing ampules of cyanide in their mouths. The Goebbels family is seen here in this 1944 photo. Goebbels' stepson Harald Quandt (top), who was absent due to military duty, was added to the group portrait after it was taken.
1945: Singer Rita Coolidge, best known for her Grammy-winning duets with then-husband Kris Kristofferson in the 1970s, is born in Lafayette, Tenn. Coolidge and Kristofferson won Grammys for Best Country Performance by a Duo or Group with Vocal for the songs "From the Bottle to the Bottom" and "Lover Please" in 1974 and 1976, respectively. Coolidge also scored four consecutive top 25 hits in 1977-1978 with "(Your Love Keeps Lifting Me) Higher and Higher," "We're All Alone," "The Way You Do The Things You Do" and "You."
1946: Film director John Woo, who became famous for Hong Kong movies such as "Hard Boiled" and "The Killer" before making such Hollywood movies as "Broken Arrow," "Face/Off" and "Mission: Impossible II," is born John Woo Yu-Sen in Guangzhou, Guangdong Province, China.
1950: Gwendolyn Brooks becomes the first black writer to win the Pulitzer Prize, winning for her book of poetry titled "Annie Allen."
1954: Singer-songwriter and music producer Ray Parker Jr., best known for writing and performing the theme song to the movie "Ghostbusters," is born in Detroit, Mich. Parker is seen here in 2009 at the Montreux Jazz Festival.
1961: Harper Lee wins the Pulitzer Prize for "To Kill a Mockingbird," her first, and only, novel. The book was in its 41st week on the bestsellers list when she won the award.
1962: The first Target discount store opens in Roseville, Minn. By the end of 1962, four more stores would open in Minnesota.
1965: Bandleader and musician Spike Jones, known for specializing in performing satirical arrangements of popular songs, dies of emphysema at the age of 53 in Beverly Hills, Calif.
1967: Elvis Presley and Priscilla Beaulieu get married in a private ceremony at the Aladdin Hotel in Las Vegas.
1967: Country music singer-songwriter and actor Tim McGraw, best known for hit songs such as "Don't Take the Girl," "Live Like You Were Dying," "Last Dollar (Fly Away)" and "Felt Good on My Lips," is born Samuel Timothy McGraw in Delhi, La. McGraw is also known for his acting roles in movies such as "Friday Night Lights," "The Blind Side" and "Country Strong."
1969: Filmmaker Wes Anderson, best known for directing movies such as "Rushmore," "The Royal Tenenbaums" and "Moonrise Kingdom," is born in Houston, Texas. Anderson has earned Oscar nominations for Best Original Screenplay for "The Royal Tenenbaums" and Best Animated Feature for "Fantastic Mr. Fox."
1971: The National Railroad Passenger Corporation, better known as Amtrak, takes over operation of U.S. passenger rail service.
1982: The 1982 World's Fair opens in Knoxville, Tenn., with the theme "Energy Turns the World." The Sunsphere, a 266-foot steel tower topped with a five-story gold globe, served as the iconic image for the fair and still stands today as a symbol for the city of Knoxville.
1989: Disney-MGM Studios opens as the third theme park at Walt Disney World near Orlando, Fla. The park, inspired by the heyday of Hollywood in the 1930s and 1940s, has since been renamed Disney's Hollywood Studios.
1991: Rickey Henderson of the Oakland Athletics steals the 939th base of his career, making him the major-league all-time leader. However, his accomplishment is overshadowed later that night by Texas Rangers pitcher Nolan Ryan, who pitches his seventh career no-hitter, breaking his own record. Both Henderson and Ryan still hold the career records for steals and no-hitters, respectively.
1998: Writer and activist Eldridge Cleaver, who became an early leader of the Black Panther Party in the 1960s, dies at the age of 62 in Pomona, Calif. Although Cleaver's family requested that his cause of death not be revealed, he was known to have diabetes and prostate cancer.
1999: The body of British climber George Mallory is found on Mount Everest 75 years after his disappearance in 1924. Mallory his climbing partner Andrew "Sandy" Irvine had disappeared while trying to make the first ascent of the mountain. It remains unknown whether or not they reached the summit before they died.
2000: American actor and bodybuilder Steve Reeves, who, at the peak of his career, was the highest-paid actor in Europe, dies from complications of lymphoma at the age of 74 in Escondido, Calif. Reeves, who won the Mr. Universe bodybuilding competition in 1950, starred in such low-budget movies as "Hercules," "Hercules Unchained," "Goliath and the Barbarians" and "The Last Days of Pompeii."
2001: Chandra Levy, an intern at the Federal Bureau of Prisons in Washington, D.C., goes missing. The resulting investigation led to allegations of an affair with U.S. Rep. Gary Condit, a married, five-term Democrat from California. Condit was never named a suspect by police and was eventually cleared of involvement. Levy's remains would be found more than a year later in a city park. Nearly eight years after her death, D.C. authorities would charge Ingmar Guandique, an illegal immigrant from El Salvador, with Levy's murder. Guandique, who had already been convicted of assaulting two other women in the park where Levy's remains were found, was convicted in November 2010 and sentenced in 2011 to 60 years in prison.
2003: While on board the USS Abraham Lincoln off the coast of California, President George W. Bush declares that "major combat operations in Iraq have ended." The speech became known as the "Mission Accomplished" speech due to a banner displayed on the aircraft carrier during the televised speech. Bush's assertion -- and the banner itself -- became controversial after guerrilla warfare in Iraq increased during the Iraqi insurgency.
2003: Professional wrestling manager Elizabeth Ann Hulette, known by her stage name Miss Elizabeth, dies of a drug and alcohol overdose at the age of 42 in Marietta, Ga. She became famous in the mid-1980s to early 1990s as the manager and eventual wife of wrestler "Macho Man" Randy Savage.
2009: Sweden becomes the seventh country in the world to legalize same-sex marriage.
2010: A car bomb is discovered in New York City's Times Square after street vendors notice smoke coming from a vehicle. The bomb ignites, but fails to detonate and is disarmed before it can cause any injuries. Faisal Shahzad, a naturalized U.S. citizen born in Pakistan, would eventually plead guilty to 10 counts arising from the bombing attempt and be sentenced to life in prison.
2011: Pope John Paul II is beatified by his successor, Pope Benedict XVI, after the Congregation for the Causes of Saints attributed one miracle to him, the healing of a French nun from Parkinson's disease. Beatification is a recognition by the Catholic Church of a dead person's entrance into heaven and capacity to intercede on behalf of individuals who pray in his or her name. It is the third of the four steps in the canonization process, which, if completed, would make John Paul II a saint.
2011: President Barack Obama announces that Osama bin Laden, the suspected mastermind behind the Sept. 11, 2001, terrorist attacks was killed by United States special forces in Abbottabad, Pakistan. Due to the time difference between the U.S. and Pakistan, bin Laden was actually killed on May 2.
Junior right fielder Nick Torres doubled to the gap in left-center field, scoring sophomore second baseman Mark Mathias from first base in the 13th inning, as No. 3 Cal Poly earned a 4-3 walk-off victory over No. 19 Cal State Fullerton before 2,831 Saturday night in Baggett Stadium.
Actress Tori Spelling recently spoke publically about her husband and fellow actor Dean McDermott's affair. But he's not the first celebrity to get in hot water over extramarital activities. Check out this list of high-profile celebrity affairs.