Muhammad Ali, born Cassius Clay in 1942, was arguably the greatest boxer of all time. Ali passed away Saturday at the age of 74. Here we take a look back at some of the most powerful, memorable, fascinating photos of him ever captured.

Human body, Human leg, Shoulder, Standing, Joint, White, Monochrome, Style, Monochrome photography, Knee, pinterest
AP
1954, age 12.
Boxing glove, Professional boxer, Boxing, Boxing equipment, Glove, Elbow, Contact sport, Striking combat sports, Combat sport, Muscle, pinterest
Dan Grossi
1962, with trainer Angelo Dundee at City Parks Gym in New York.
Finger, Sitting, Hand, Formal wear, Dress shirt, Suit trousers, Suit, Blazer, Gesture, Thumb, pinterest
Marvin Lichtner/Pix Inc./The LIFE Images Collection
1963, holding up three fingers to show his prediction for how many rounds his opponent Charlie Powell will fall in, in Pittsburgh, Pennsylvania.
Road surface, Standing, Asphalt, Monochrome, Monochrome photography, Black-and-white, Gesture, Tar, Walking, Park, pinterest
Alamy
1963, in London, England.
Comfort, Linens, Bedding, Sleep, Nap, Bed sheet, Blanket, Bedtime, pinterest
Alamy
1963, in London, England.
Footwear, Leg, Arm, Human body, Photograph, White, Room, Style, Black-and-white, Photography, pinterest
Steve Schapiro
1963, shadowboxing in his family's home in Louisville, Kentucky.
Finger, Hand, Joint, Wrist, Nail, Thumb, Gesture, Monochrome photography, Black-and-white, Arthropod, pinterest
Steve Schapiro//Getty Images
1963, holding a pair of mini-boxing gloves at his family's home in Louisville, Kentucky.
Professional boxer, Elbow, Interaction, Contact sport, Barechested, Combat sport, Striking combat sports, Boxing, Muay thai, Circle, pinterest
1964, battling for heavyweight champion of the world against Sonny Liston in Miami, Florida.
Arm, Combat sport, Striking combat sports, Barechested, Chest, Contact sport, Muscle, Trunk, Wrestler, Individual sports, pinterest
1964, following his victory over Sonny Liston, which made him the new heavyweight champion of the world.
Face, Hat, Monochrome, Tie, Buzz cut, Sun hat, Fedora, Crew cut, pinterest
Bob Gomel/The LIFE Images Collection//Getty Images
1964, celebrating in Miami, Florida following his defeat of Sonny Liston.
Face, Tie, Dishware, Suit, Formal wear, Serveware, Cap, Plate, Blazer, Monochrome, pinterest
Bob Gomel/The LIFE Images Collection//Getty Images
1964, from that same night post-heavyweight championship win with Malcom X (R) in Miami, Florida.
Human body, Muscle, Chest, Barechested, Monochrome, Contact sport, Abdomen, Black-and-white, Monochrome photography, Stomach, pinterest
Chris Smith/Popperfoto//Getty Images
1964, joking around with the Beatles (from left to right, George Harrison, Ringo Starr, John Lennon and Paul McCartney) in Miami, Florida.
Human body, Elbow, Standing, Wrist, Flash photography, Chest, Belt, Stock photography, pinterest
Harry Benson
1965.
Lighting, Light, Electricity, Back, Lens flare, Walking shoe, Safety glove, pinterest
Brian Hamill//Getty Images
1965, in San Juan, Puerto Rico.
People, Standing, Photograph, Monochrome, House, Monochrome photography, Black-and-white, Vintage clothing, Family, Brick, pinterest
Alamy
1965, with his family in Louisville, Kentucky.
Sitting, Textile, Room, Comfort, Linens, Black-and-white, Living room, Tablecloth, Stock photography, pinterest
Alamy
1965, reading through fan mail with his mother, Odessa in Louisville, Kentucky.
People, Bridle, Horse supplies, Halter, Rein, Horse tack, Working animal, Horse, Uniform, Livestock, pinterest
Peter Kemp
1966, in London, England.
Boxing, Sport venue, Boxing glove, Boxing equipment, Professional boxer, Boxing ring, White, Combat sport, Contact sport, Striking combat sports, pinterest
R. McPhedran
1966, ring training in London, England.
Dog breed, Dog, Carnivore, Companion dog, Monochrome, Sporting Group, Canidae, Monochrome photography, Black-and-white, Ancient dog breeds, pinterest
1966, with Henry Cooper and a corgi in London, England.
Head, People, Social group, Style, Interaction, Suit, Jheri curl, Friendship, Monochrome, Gesture, pinterest
Alamy
1966, Ali holds 3-year-old Mark Griffiths in London, England.
Ball, Sports equipment, Human leg, Basketball moves, Joint, Football, Knee, Elbow, Shorts, Ball, pinterest
1966, Cleveland Williams lies on the canvas post-Ali takedown in Houston, Texas.
Hat, Hand, Joint, Wrist, Elbow, Style, Chest, Fashion accessory, Barechested, Muscle, pinterest
John Lindsay
1967, receiving a check-up from Dr. Harry Kleinman at the New York Athletic Commission in New York City.
Human body, Trousers, Dress shirt, Suit trousers, Photograph, Standing, Suit, Formal wear, Style, Monochrome, pinterest
AP
1967, with Wilt Chamberlain.
Musician, Musical instrument, Music, Plucked string instruments, String instrument, String instrument, Guitarist, Guitar, Suit, Guitar accessory, pinterest
1967, with Johnny Carson, star of NBC-TV's
Trousers, Shoe, Shirt, Monochrome, Standing, Style, Dress shirt, Collar, Monochrome photography, Black-and-white, pinterest
1967, greeting six-year-old Manuel de la Sierra of Mexico City, Mexico.
Clothing, Head, Coat, Dress shirt, Collar, Social group, Shirt, Suit, Standing, Outerwear, pinterest
Robert Abbott Sengstacke
1967, with basketball players Bill Russell (L) and Kareem Abdul Jabbar (R) in Cleveland, Ohio.
Shoulder, Human leg, Standing, Joint, Chest, Elbow, Shorts, Knee, Trunk, Muscle, pinterest
Carl Fischer
1968, Ali as St. Sebastian, shot for the cover of Esquire Magazine.
Audio equipment, Microphone, Microphone stand, Public address system, Sculpture, Public speaking, Speech, Stage equipment, Spokesperson, Audio accessory, pinterest
Alamy
1968, listening to Elijah Muhammad speak at a convention in Chicago, Illinois.
Facial hair, Monochrome, Beard, Moustache, Afro, pinterest
1969, wearing a wig and beard for his acting debut in the musical
Leg, Monochrome, Bicycle wheel, Style, Monochrome photography, Sitting, Black-and-white, Curtain, Blazer, Light fixture, pinterest
Ed Kolenovsky
1970, in Houston, Texas following the refusal of his draft determent appeal by the Houston Selective Service appeals board.
Shoulder, Elbow, Muscle, Barechested, Photography, Flash photography, Portrait photography, Stock photography, Leather, Flesh, pinterest
Chris Smith//Getty Images
1971, training in Miami, Florida.
Standing, Monochrome, Monochrome photography, Black-and-white, Snapshot, Photography, Vintage clothing, Brick, pinterest
1971, having his photo taken by Andy Warhol in Deer Lake, Pennsylvania.
Wheel, Shoe, Baby carriage, Baby Products, Toddler, Bicycle, Spoke, Rolling, Bicycle tire, Baby, pinterest
Getty Images
1971, with his daughters, training for a fight in Zurich, Switzerland.
Headgear, Costume accessory, Headpiece, Camera, Single-lens reflex camera, Crown, Photography, Costume hat, Thumb, Reflex camera, pinterest
Joe Migon
1971, in Miami, Florida.
Monochrome, Monochrome photography, Black-and-white, Mesh, Wire fencing, Beard, Commemorative plaque, pinterest
John Shearer/The LIFE Picture Collection//Getty Images
1971, taunting Joe Frazier at Frazier's training headquarters in Philadelphia, Pennsylvania.
Winter, Freezing, Standing, Outdoor recreation, Slope, Monochrome photography, Snow, Black-and-white, Monochrome, Winter sport, pinterest
Walter Zeboski
1972, training in the snow in Stateline, Nevada.
Human, Bridle, Halter, Horse, Horse supplies, Horse tack, Rein, Saddle, Working animal, Boot, pinterest
Alamy
1973, riding a horse in Deer Lake, Pennsylvania.
Nose, Chin, Cap, Headgear, Photography, Portrait photography, Boxing equipment, Tribe, Boxing, Boxing glove, pinterest
Alamy
1973, in Las Vegas, Nevada.
Human body, Monochrome, Monochrome photography, Black-and-white, Costume, pinterest
Robert Walker/The New York Times
1974, training in Deer Lake, Pennsylvania.
Sport venue, People, Shoe, Elbow, Photograph, Crowd, White, Style, Competition event, Combat sport, pinterest
Central Press//Getty Images
1975, in a title fight against Joe Bugner at the Merdeka Stadium in Kuala Lumpur.
Head, People, Photograph, White, Style, Monochrome, Monochrome photography, Interaction, Temple, Black, pinterest
Bill Hudson
1977, kissing his newborn daughter, Laila, in Miami, Florida.
Face, Hair, Head, Nose, Arm, Ear, Human, Mouth, Leg, Cheek, pinterest
Frank Tewkesbury/Evening Standard//Getty Images
1978, with daughters Laila (L) and Hana (R) in London, England.
Architecture, Landmark, Facade, Temple, Medieval architecture, Turret, Arch, Finial, Spire, Byzantine architecture, pinterest
1978, in Moscow, Russia.
Leg, Shoe, Human body, Floor, Monochrome, Foot, Kneeling, Sandal, pinterest
1978, taking part in prayers at a mosque in Moscow, Russia.
Monochrome, Standing, Style, Monochrome photography, Black-and-white, Street fashion, Tints and shades, Snapshot, Photography, Portrait photography, pinterest
Alamy
1981, training in the Bahamas.
People, Crowd, Monochrome, Black-and-white, Monochrome photography, Audience, Sun hat, Ceremony, Fedora, pinterest
Alamy
1984, signing autographs for a mob of fans in Birmingham, England.
Arm, Finger, Hand, Wrist, Monochrome, Monochrome photography, Thumb, Gesture, Black-and-white, Chest, pinterest
Marty Lederhandler
1985, with Liberace and Hulk Hogan in New York City.
Uniform, Candle holder, pinterest
Michael Cooper//Getty Images
1996, lighting the Olympic Torch in Atlanta, Georgia.
Sitting, Hand, Wrist, Comfort, Picture frame, Watch, Interior design, Lap, Living room, Conversation, pinterest
Karen Cooper
1997, with Prince in Washington, D.C.
Head, Ear, Cheek, Eye, Forehead, Room, Interaction, Iris, Love, Comfort, pinterest
Via Laila Ali/Facebook
2012, with granddaughter, Sydney.
Headshot of Elizabeth Griffin
Elizabeth Griffin
Strategic Visual Content Editor for Hearst Digital Media, Photo Editor of Esquire.com, and staff photographer at Hearst. Basically, I am a MadLib.