Cassius Marcellus Clay Jr. (later known as Muhammad Ali) is born in Louisville, Kentucky, to Odessa Grady Clay and Cassius Marcellus Clay Sr.
Clay makes his amateur boxing debut against Ronnie O’Keefe, winning by split decision; this begins an amateur career that would culminate in Olympic gold.
Clay first hears about the Nation of Islam while fighting in the Golden Gloves tournament in Chicago, an early step toward his later religious and political identity.
As his amateur career peaks, Clay trains under Louisville coach Joe E. Martin, who helped direct him into boxing as a child.
Cassius Clay and his trainer Joe E. Martin, January 1960
Clay wins the light heavyweight gold medal at the 1960 Summer Olympics in Rome, becoming a global sports figure before turning professional.
Clay defeated veteran Pole Zbigniew Pietrzykowski to win gold in the 1960 Summer Olympics.
Clay makes his professional debut, winning a six-round decision over Tunney Hunsaker, launching a rapid rise through the heavyweight ranks.
A poster publicizes Clay’s early professional run, reflecting his growing profile as he builds an undefeated record.
On-site poster for Cassius Clay's fifth professional bout
Clay hires Angelo Dundee as his trainer after leaving Archie Moore’s camp, beginning one of boxing’s most influential trainer–fighter partnerships.
Clay is listed as draft-eligible (Class 1-A) after registering for conscription on his 18th birthday, a status that would later become central to his public stance during the Vietnam War.
Clay meets Malcolm X, who becomes a key spiritual and political mentor during Clay’s early years of involvement with the Nation of Islam.
Clay fights Doug Jones at New York’s Madison Square Garden, winning a controversial decision in what is described as his toughest bout of that early stretch.
By the end of the year, Clay becomes the top contender for heavyweight champion Sonny Liston, setting up a defining title challenge.
Clay defeats Sonny Liston by TKO in Miami Beach, winning the world heavyweight championship in a major upset and becoming a central figure in global sport and culture.
Clay dodges a punch from Liston
Elijah Muhammad announces Clay’s new name, Muhammad Ali, publicly linking the champion to the Nation of Islam.
Ali is seen in the background at an address by Elijah Muhammad, reflecting his growing public association with the Nation of Islam after becoming champion.
Ali (seen in background) at an address by Elijah Muhammad in 1964
Ali marries Sonji Roi; the marriage later ends amid conflict over religion and expectations tied to the Nation of Islam.
Ali wins a controversial rematch with Liston in Lewiston, Maine, by first-round knockout in the bout known for the disputed “phantom punch.”
Ali standing over Sonny Liston during their second fight
Ali defends his heavyweight title against Floyd Patterson, winning by 12th-round TKO amid criticism over his in-ring theatrics.
Ali and Patterson in action
Ali divorces Sonji Roi, ending his first marriage.
Ali is reclassified by the Louisville draft board as 1-A and publicly states he will refuse military service, placing his career and public standing in jeopardy.
After a title defense against Zora Folley, Ali is stripped of his title due to his refusal to be drafted into U.S. military service.
Ali refuses induction into the U.S. Armed Forces in Houston, is arrested, and soon after has his boxing license suspended and title stripped by boxing authorities.
At the Cleveland Summit, prominent African-American athletes and leaders meet with Ali and publicly support his draft resistance.
Ali is convicted of draft evasion, sentenced to five years in prison and fined $10,000; he remains free on bond while appealing.
Ali leaving court in June 1967
Ali marries 17-year-old Belinda Boyd (later Khalilah Ali), beginning a marriage that would include four children.
Ali and Boyd after their wedding
During his boxing exile, Ali stars in the short-lived Broadway musical Buck White, expanding his public presence beyond sport.
Civil rights leader Ralph Abernathy honors Ali with the annual Martin Luther King Award, recognizing the wider impact of his draft resistance.
Ali is granted a boxing license in Atlanta, a crucial step in ending his exile from sanctioned bouts and beginning his return to the ring.
Ali returns to professional boxing and defeats Jerry Quarry after three rounds when Quarry is cut.
Ali fights Joe Frazier in the “Fight of the Century” at Madison Square Garden, losing by unanimous decision—his first professional defeat.
Ali knocked down by Frazier in the 15th round
The U.S. Supreme Court overturns Ali’s conviction in Clay v. United States by a unanimous 8–0 decision, removing the legal penalty stemming from his draft refusal.
Ali defeats Frazier in their second bout at Madison Square Garden by unanimous decision, setting up a path to another title shot.
Ali vs. Frazier, promotional photo
Ali attends a Saviours’ Day celebration, reflecting his continued high-profile involvement with the Nation of Islam around the time of his second championship run.
Ali attending a Saviours' Day celebration in 1974
Ali defeats George Foreman by eighth-round knockout in Kinshasa, Zaire, in The Rumble in the Jungle, regaining the world heavyweight title and popularizing the “rope-a-dope” tactic.
Foreman falling to the canvas after a hard right straight to the face
Ali’s home in Louisville later becomes associated with major civic recognition, and he continues to build a legacy that reaches beyond boxing into culture and philanthropy.
Ali defeats Frazier by TKO in their third bout, the “Thrilla in Manila”, a brutal contest that became one of boxing’s most famous rivalries and defining fights.
Ali defeats Richard Dunn by fifth-round TKO; it becomes the last time he would knock out an opponent in his professional career.
Ali defeats Ken Norton in their third fight at Yankee Stadium, then announces retirement plans tied to his faith and evolving religious identity.
Ali appears at a White House dinner with President Jimmy Carter and his wife Veronica Porché, reflecting his prominence in American public life beyond sport.
President Jimmy Carter greets Ali, along with his wife Veronica Porché, at a White House dinner, 1977.
Ali is photographed with his daughter Hana as a baby, during a period when his family life and celebrity status were closely followed.
Ali with his daughter Hana as a baby in 1977
Ali loses the heavyweight title to Leon Spinks by split decision in Las Vegas, one of the biggest upsets of his late career.
Ali defeats Spinks in a rematch at the Superdome, becoming the first heavyweight champion to win the title three times.
Ali announces his retirement from boxing, though he later returns for additional bouts.
Ali returns to fight Larry Holmes at Caesars Palace; Holmes dominates and the bout is stopped after the tenth round, Ali’s only stoppage loss.
Ali appears with clowns Charlie Frye and Skeeter Reece, reflecting his ongoing entertainment and media presence even as his boxing career nears its end.
Ali with clowns Charlie Frye and Skeeter Reece in 1980
Ali fights his final professional bout, losing a ten-round decision to Trevor Berbick in Nassau, Bahamas.
In Los Angeles, Ali talks a suicidal man down from jumping off a ninth-floor ledge, an incident widely reported in national news.
Ali meets President Ronald Reagan in the Oval Office, underscoring his role as a major public figure in U.S. life.
President Ronald Reagan with Ali in the Oval Office in 1983
Ali is diagnosed with Parkinson's syndrome, beginning a long period of declining health while he remains active in public life.
Ali serves as special guest referee at the inaugural WrestleMania I, highlighting his crossover appeal beyond boxing.
Ali (right) as a special guest referee along with Pat Patterson (middle) at WrestleMania I, with Liberace (left) as timekeeper
Ali marries Yolanda “Lonnie” Williams, who later becomes his primary caregiver and helps manage and consolidate his intellectual properties.
Ali returns to Mecca for another Hajj pilgrimage, part of his continuing commitment to Islam after shifting toward mainstream Sunni practice.
Ali travels to Iraq before the Gulf War and meets Saddam Hussein to negotiate the release of American hostages, securing their freedom but drawing criticism in the U.S.
Ali lights the Olympic torch at the 1996 Summer Olympics in Atlanta, a globally watched moment that symbolized his enduring cultural stature despite Parkinson’s.
Ali is photographed in 1997 as he continues public appearances while living with Parkinson’s syndrome.
Ali in 1997
Ali works with actor Michael J. Fox to raise awareness and funding for Parkinson’s research, including a joint appearance before Congress in 2002.
Ali and Michael J. Fox testify before a Senate committee on providing government funding to combat Parkinson's.
President George W. Bush presents Ali with the Presidential Medal of Freedom, recognizing his athletic and humanitarian impact.
President George W. Bush embraces Ali after presenting him with the Presidential Medal of Freedom in 2005, during ceremonies at the White House.
Ali is photographed with his wife Lonnie in Washington, D.C., during a period when he continued public life while managing advancing Parkinson’s symptoms.
Ali with wife Lonnie in Washington, D.C., 2001
Ali is hospitalized for a mild case of pneumonia, part of a series of health crises during his later years.
Ali is hospitalized for a urinary tract infection after being found unresponsive at a guest house in Scottsdale, Arizona, and is released the next day.
Ali dies in Scottsdale, Arizona, at age 74, from septic shock after being hospitalized with a respiratory illness.
Ali’s funeral and memorial events take place in Louisville, including an Islamic Janazah prayer at Freedom Hall and a public memorial at the KFC Yum! Center; he is interred at Cave Hill Cemetery.
Louisville’s main airport is renamed Louisville Muhammad Ali International Airport, reflecting his lasting civic legacy in his hometown.
The U.S. Postal Service holds a first-day-of-issue ceremony in Louisville for a Muhammad Ali Forever stamp, using a 1974 photograph and printing 22 million stamps.