Question: When was the African American mayor, who defeated by Rudolph Giuliani in 1993, born?

Context paragraphs:
Giuliani Partners: Giuliani Partners LLC is a management consulting and security consulting business founded by former New York City Mayor Rudolph Giuliani in January 2002.

Igor Babailov: Igor Valerievich Babailov (born February 9, 1965) is a Russian-born American painter and portrait artist, known for his commissioned portraits of global leaders, celebrities and distinguished individuals.  Some of his notable portraits include those of: Pope Benedict XVI (Vatican), President of Russia Vladimir Putin (Kremlin), New York State Appellate Division Justice Joseph P. Sullivan (Appellate Division Courthouse of New York State), Mayor Rudolph Giuliani of New York (Giuliani Partners), Canadian Prime Minister Brian Mulroney (House of Commons), pianist Byron Janis

David Dinkins: David Norman Dinkins (born July 10, 1927) is an American politician, lawyer, and author who served as the 106th Mayor of New York City, from 1990 to 1993.  He was the first and to date, the only African American to hold that office.

Harold Moss: Harold Moss (born 1929) is an American politician, whose political career has taken place in Tacoma, Washington.  He was the first African American member of that city's city council, its first African American mayor, and the first African American member of the Pierce County Council.  Moss's wife, Bil Moss, has also served on the Tacoma City Council.

Thomas Von Essen: Thomas Von Essen (born 1945 in Brooklyn, New York) was appointed the 30th FDNY Commissioner of the City of New York by Mayor Rudolph W. Giuliani on April 15, 1996 and served in that position until the end of the Rudolph Giuliani Administration on December 31, 2001, nearly four months after the September 11, 2001 attacks.

New York City mayoral election, 1993: The New York City mayoral election of 1993 occurred on Tuesday, November 2, 1993, with Republican nominee U.S. Attorney for the Southern District of New York Rudolph Giuliani narrowly defeating incumbent Democratic mayor David Dinkins.  They also faced several third-party candidates.

Ivy Taylor: Ivy Ruth Taylor (born June 17, 1970) is an American politician and urban planner who served as the mayor of San Antonio, Texas from 2014 through 2017.  She was a nonpartisan officeholder, although she is registered as a Democrat.  She was also the first African American to be elected mayor of San Antonio and only the second woman in the position.  In addition, Taylor was the first female African American mayor of a city with a population of more than one million.

Blair-Caldwell African American Research Library: The Blair-Caldwell African American Research Library is a branch of the Denver Public Library in Denver, Colorado, in the United States that serves the Five Points neighborhood.  It is also a research library with collections focusing on the history of African Americans in Denver and the American West.  The library was conceived by Denver's first African American mayor, Wellington Webb, and his wife Wilma Webb, who observed that the history of African-Americans in Denver and the American West was under-represented.  The library was envisioned in 1999 and designated the Blair-Caldwell African American Research Library in honor of Omar Blair, the first black president of the Denver school board, and Elvin Caldwell, the first black city council member.  Ground breaking occurred in early 2002.

Richard E. Jackson: Richard Ernest Jackson Jr. (born July 18, 1945) is an American politician and mathematics teacher.  He made black history in 1984 when he became Mayor of the City of Peekskill.  Peekskill was the first city in all of New York State to have an African American Mayor, making Jackson - as reported by both the New York Times .  and Ebony Magazine.  - New York State's first African American Mayor.  In 1974, the Village of Bridgewater (population 574) laid some claim that their Village elected an African American Mayor, Everett T. Holmes, prior to Mayor Jackson's appointment.  Everett served as mayor from 1974-1976 and from 1979 until his death in 1982.  However, the village of Cleveland in Oswego County can claim the first African American to be elected its chief executive.  Edward "Ned" Sherman was elected in a special election in May, 1878 to fill the unexpired term of the chief executive, called President of the village, who quit a month after being elected.

George Livingston: George Livingston (c. 1933 – January 7, 2012) was an American politician who served as the first elected African American Mayor of Richmond, California, from 1985 to 1993.  Livingston was appointed Mayor in 1985 by the city council.  He won election as Richmond's first elected African American mayor in 1989 for a full term.

Supporting paragraphs: New York City mayoral election, 1993 David Dinkins
Answer: July 10, 1927