Image credits

Alexander Gardner · Public domain · Source

Margaret Sarah Carpenter · Public domain · Source

Etching created by Cadell and Davies (1811), John Horsburgh (1828) or R.C. Be... · Public domain · Source

Elliott & Fry · Public domain · Source

The University of Vermont Alumni Magazine vol. 39 no. 01, p. 22. · Public domain · Source

Ferdinand Schmutzer / Adam Cuerden · Public domain · Source

John Trumbull · Public domain · Source

Unknown authorUnknown author · Public domain · Source

Joseph Karl Stieler · Public domain · Source

Ralph Eleaser Whiteside Earl · Public domain · Source

Jacques-Louis David · Public domain · Source

Domenico Fetti · Public domain · Source

After Lysippos · Public domain · Source

anonymous · Public domain · Source

Joseph-Siffred Duplessis · Public domain · Source

Honourable Bertrand Russell.jpg: Photographer not identified derivative work:... · Public domain · Source

Gottlieb Biermann / After Christian Albrecht Jensen · Public domain · Source

NASA/JPL · Public domain · Source

After Alexander Roslin · Public domain · Source

Charlemagne. Autorité émettrice de monnaie indéterminé. Atelier monétaire. Ém... · Public domain · Source

Herbert Rose Barraud · Public domain · Source

Jeremiah Gurney · Public domain · Source

Bernard Vaillant · Public domain · Source

Nadar · Public domain · Source

Louis le Grand · Public domain · Source

Allan Ramsay · Public domain · Source

Unknown authorUnknown author · Public domain · Source

Unknown authorUnknown author Publisher: Mathematical Association of America [... · Public domain · Source

Department of Energy-Office of Public Affairs, restored by Yann · Public domain · Source

Lloyd Arnold · Public domain · Source

George Grantham Bain Collection (Library of Congress) · Public domain · Source

Paul van Somer I / Formerly attributed to Frans Pourbus the Younger · Public domain · Source

Eveleen Myers (née Tennant) · Public domain · Source

Leon Perskie · CC BY 2.0 · Source

Atelier Jacobi: Sigismund Jacobi (1860–1935) · Public domain · Source

Maria Wodzińska · Public domain · Source

Anton Graff · Public domain · Source

Guillermo Kahlo · Public domain · Source

Friedrich Hermann Hartmann · Public domain · Source

Vasily Perov · Public domain · Source

Justus Sustermans · Public domain · Source

Unknown authorUnknown author · Public domain · Source

Jakob Schlesinger · Public domain · Source

Attributed to Balthasar Denner · Public domain · Source

Cassowary Colorizations · CC BY 2.0 · Source

Gilbert Stuart · Public domain · Source

Christoph Bernhard Francke · Public domain · Source

Fratelli Alinari · Public domain · Source

Horatio Seymour Squyer · Public domain · Source

Elbert Hubbard (June 19, 1856 – May 7, 1915) · Public domain · Source

Becker · Public domain · Source

Phillip Leonian [1] from New York World-Telegram & Sun.[2] · Public domain · Source

Godfrey Kneller · Public domain · Source

Unknown authorUnknown author · Public domain · Source

Unknown authorUnknown author · Public domain · Source

Cassandra Austen · Public domain · Source

Maurice Quentin de La Tour · Public domain · Source

Unknown author · Public domain · Source

Elias Gottlob Haussmann · Public domain · Source

Joseph Karl Stieler · Public domain · Source

August Köhler [1] · Public domain · Source

Gilbert Stuart · Public domain · Source

Portrait_john_calvin.jpg: Anonymous · Public domain · Source

Cecil W. Stoughton · Public domain · Source

Godfrey Kneller · Public domain · Source

anonymous · Public domain · Source

jklamo Cleaned and enhanced by Julielangford · Public domain · Source

London Stereoscopic Company · Public domain · Source

Ángel M. Felicísimo from Mérida, España · Public domain · Source

John Jabez Edwin Mayall · Public domain · Source

Unknown authorUnknown author · Public domain · Source

Attributed to Francesco Melzi · Public domain · Source

Jakob Emanuel Handmann · Public domain · Source

Thomas Phillips · Public domain · Source

Paul Nadar · Public domain · Source

Joseph Karl Stieler · Public domain · Source

Moritz Nähr · Public domain · Source

Elliott & Fry · Public domain · Source

Unknown author · CC BY 2.5 · Source

Unknown authorUnknown author · Public domain · Source

Unknown authorUnknown author · Public domain · Source

Unknown authorUnknown author · Public domain · Source

Lucas Cranach the Elder · Public domain · Source

Associated Press · Public domain · Source

York College ISLGP · CC BY 2.0 · Source

Thomas Phillips · Public domain · Source

Attributed to Daniele da Volterra · Public domain · Source

Jacques-Louis David · Public domain · Source

Santi di Tito · Public domain · Source

Unknown authorUnknown author · Public domain · Source

The American Institute of Physics credits the photo [1] to AB Lagrelius &... · Public domain · Source

Napoleon Sarony · Public domain · Source

After Samuel Cooper · Public domain · Source

André Bockmann · Public domain · Source

Argentina. Revista Vea y Lea · Public domain · Source

Nobel Foundation · Public domain · Source

Attributed to Jean-Marc Nattier · Public domain · Source

Jean-Baptiste Paulin Guérin · Public domain · Source

Marie-Lan Nguyen · CC BY 2.5 · Source

Unidentified painter · Public domain · Source

Alexander Bassano · Public domain · Source

Raphael · Public domain · Source

Rembrandt · Public domain · Source

After Frans Hals · Public domain · Source

Franz Hanfstaengl · Public domain · Source

Van Vechten, Carl, 1880-1964. · Public domain · Source

Max Halberstadt · Public domain · Source

Copy of Lysippos (?) · Public domain · Source

Konrad Jacobs · Public domain · Source

NASA · Public domain · Source

Unknown authorUnknown author · Public domain · Source

Adam Cuerden · Public domain · Source

Louis Bachrach, Bachrach Studios, restored by Michel Vuijlsteke · Public domain · Source

John Michael Wright · Public domain · Source

Rembrandt Peale · Public domain · Source

Hans Holbein the Younger · Public domain · Source

Henry Ulke · Public domain · Source

Étienne Carjat · Public domain · Source

George Charles Beresford / Adam Cuerden · Public domain · Source

Nicolas de Largillière · CC0 · Source

Unknown authorUnknown author · Public domain · Source

Attributed to John Taylor · Public domain · Source

Yousuf Karsh · Public domain · Source

Barbara Krafft · Public domain · Source