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author - Public Domain
Michael Bidner -
Original painter unknown, digitized by Internet Archive, converted and cropped by me - Public Domain
J. R. Skelton (Joseph Ratcliffe Skelton; 1865–1927) (illustrator), erroneously credited as John R. Skelton - Public Domain
Brady-Handy Photograph Collection (Library of Congress) - Public Domain
unknown - Public Domain
Al Ramones & Domie Quiazon - Public Domain
John K. Hillers(?) - Public Domain
Jtell - CC BY-SA 3.0
Charles Lhuillier - Public Domain
Smithsonian Institution -
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author - Public Domain
Nesch, Rolf, 1893-1975
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Michael Bidner -
Heys, John Edward, 1948-
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Felix V, Antipope, 1383-1451
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Lémontey, Pierre Edouard (1762-1826).
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Currie, Arthur, Sir, 1875-1933
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Strindberg, August, 1849-1912
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Original painter unknown, digitized by Internet Archive, converted and cropped by me - Public Domain
Bloomfield, Maurice, 1855-1928
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Hildreth, Samuel P. (Samuel Prescott), 1783-1863
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Hurd, Richard, 1720-1808
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J. R. Skelton (Joseph Ratcliffe Skelton; 1865–1927) (illustrator), erroneously credited as John R. Skelton - Public Domain
Columba, Saint, 521-597
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Bertrand, Aloysius, 1807-1841
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Rembrandt Harmenszoon van Rijn, 1606-1669
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Richards, Denise, 1971-
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Lawrence, Tracy
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Brady-Handy Photograph Collection (Library of Congress) - Public Domain
Ambler, Jacob A., 1829-1906
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unknown - Public Domain
Jones, William E., 1824-1864
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Al Ramones & Domie Quiazon - Public Domain
Murphy, Richard W. (Richard William), 1929-
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John K. Hillers(?) - Public Domain
Young Man Afraid of His Horse, 1836-1893
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Degouve de Nuncques, William, 1867-1935
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Jtell - CC BY-SA 3.0
Houbart, François-Henri
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Ohnesorge, Wilhelm, 1872-1962
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Birkhoff, Garrett, 1911-1996
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Bushyhead, Dennis Wolfe, 1826-1898
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Walker, Stuart, 1888-1941
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Charles Lhuillier - Public Domain
Le Goffic, Charles, 1863-1932
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Bricker, John W. (John William), 1893-1986
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unknown - Public Domain
Lowden, Frank O. (Frank Orren), 1861-1943
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Smithsonian Institution -
Blakeslee, Albert Francis, 1874-1954
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Accursio, Mariangelo, 1489-1546
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Hawker, C. A. S. (Charles Allan Seymour), 1894-1938