what are soem important events that happened on this day?

Question

particularly in 1991?

Answer 1

MAY 23rd

On this day in history in 1701, died William Kidd.
Captain Kidd was notorious as a pirate and legendary for accounts of his buried treasure, but in fact was an innocent victim of malicious rumours.

For more, see this site:

Answer 2

Events:
1990 - The Windows 3.0 operating system is released by Microsoft.
1992 - After 30 years, 66-year-old Johnny Carson hosts The Tonight Show for the last time.
1995 - Bangladesh Shahityacharcha Kendro established.
1997 - Kelly Flinn, US Air Force's first female bomber pilot certified for combat, accepts a general discharge in order to avoid a court martial.
1998 - Lewinsky scandal: A federal judge rules that United States Secret Service agents can be compelled to testify before a grand jury concerning the scandal, involving President Bill Clinton.
2002 - In Washington, DC, the remains of the missing Chandra Levy are found in Rock Creek Park.
2002 - American civil rights movement: A jury in Birmingham, Alabama, convicts former Ku Klux Klan member Bobby Frank Cherry of the 1963 murders of four girls in the bombing of the 16th Street Baptist Church.
2003 - In Fort Worth, Texas, Annika Sörenstam becomes the first woman to play the PGA Tour in 58 years.
2004 - Felipe, Prince of Asturias, of the Spanish Royal Family marries Letizia Ortiz Rocasolano.
2004 - The U.S. town of Hallam, Nebraska, is wiped out by a powerful F4 tornado that broke a width record at an astounding 2.5 miles wide. It also killed one local resident.
2006 - Results from the Montenegrin independence referendum, 2006 are announced. 55.4% of voters voted to become independent from the Serbia and Montenegro Union.
Deaths:
1990 - Rocky Graziano, American boxer (b. 1922)
1992 - Zellig Harris, American linguist (b. 1909)
1997 - Alfred Hershey, American biochemist, recipient of the Nobel Prize in Physiology or Medicine (b. 1908)
1998 - José Enrique Moyal, mathematical physicist (b. 1910)
2003 - Ousmane Zongo, Burkinabé shooting victim
2004 - Richard Biggs, American actor (b. 1960)
2004 - Mikhail Voronin, Russian gymnast (b. 1945)
2005 - Charilaos Florakis, Greek politician, long-time General Secretary of the Communist Party of Greece (b. 1914)
2005 - Julia Randall, American poet (b. 1924)
2005 - Thurl Ravenscroft, American voice actor and singer (b. 1914)
2006 - Lee Jong-wook, Korean Director-General of the World Health Organisation (b. 1945)
2006 - Heather Crowe, Canadian activist (b. 1945)
Nothing for 1991 apparently.