Lorenzo de' Medici (1449-1492) was a Florentine banker, politician, and patron of the arts. He is credited with being the first major art collector, and his collection included works by Michelangelo, Raphael, and Botticelli.

Peggy Guggenheim (1898-1979) was an American art collector and patron of the arts. She is best known for her collection of Impressionist and Post-Impressionist art, which included works by Picasso, Kandinsky, and Mondrian.

The Guggenheim Museum is an art museum located in New York City. It was founded by Solomon R. Guggenheim in 1937 and is known for its collection of modern and contemporary art.

Charles Saatchi (born 1943) is a British advertising executive, art collector, and patron of the arts. He is known for his collection of contemporary art, which includes works by Jeff Koons, Damien Hirst, and Tracey Emin.

The Andrew W. Mellon Collection is a collection of art assembled by Andrew W. Mellon (1855-1937), an American banker, industrialist, and philanthropist. The collection is now housed in the National Gallery of Art in Washington, D.C.

Charles Lang Freer (1854-1919) was an American industrialist and art collector. He is known for his collection of Asian art, which is now housed in the Freer Gallery of Art and Arthur M. Sackler Gallery in Washington, D.C.

The Peggy Guggenheim Collection is a collection of art assembled by Peggy Guggenheim (1898-1979), an American art collector and patron of the arts. The collection is now housed in the Peggy Guggenheim Collection in Venice, Italy.

Henry Clay Frick (1849-1919) was an American industrialist and art collector. He is known for his collection of Old Master paintings, which is now housed in the Frick Collection in New York City.

The J.P. Morgan Collection is a collection of art assembled by J.P. Morgan (1837-1913), an American financier and art collector. The collection is now housed in the Metropolitan Museum of Art in New York City.

Gertrude Vanderbilt Whitney (1875-1942) was an American sculptor, art collector, and patron of the arts. She is known for her collection of American art, which is now housed in the Whitney Museum of American Art in New York City.

The Saatchi Collection is a collection of art assembled by Charles Saatchi (born 1943), a British advertising executive, art collector, and patron of the arts. The collection is now housed in the Saatchi Gallery in London.

Eli Broad (1933-2021) was an American businessman, philanthropist, and art collector. He is known for his collection of contemporary art, which is now housed in the Broad Museum in Los Angeles.

The David Geffen Collection is a collection of art assembled by David Geffen (born 1943), an American businessman, film producer, and art collector. The collection is now housed in the Geffen Contemporary at the Museum of Contemporary Art, Los Angeles.

Steven A. Cohen (born 1956) is an American hedge fund manager, art collector, and philanthropist. He is known for his collection of modern and contemporary art, which is now housed in the Steven A. Cohen Collection.

The Liechtenstein Collection is a collection of art assembled by the royal family of Liechtenstein. The collection is now housed in the Liechtenstein Museum in Vienna.