Ferdinand I of Portugal —
Photo Credit: By Jean de Wavrin; Seignur de Forestel - Public Domain, https://commons.wikimedia.org/w/index.php?curid=55928756

King Peter I of Portugal — Recumbent effigy on his tomb - O Baú da História
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=44126235

Pope Eugene IV — In the Basilica of Saint Paul Outside the Walls, Rome
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=42732416

Pope Nicholas V — In the Basilica of Saint Paul Outside the Walls, Rome
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=42732435

University of Glasgow's coat of arms/logo —
Photo Credit: By Source (WP:NFCC#4), Fair use, https://en.wikipedia.org/w/index.php?curid=54026486

Joseph Black —
Photo Credit: By Rogers, J - Public Domain, https://commons.wikimedia.org/w/index.php?curid=19132802

John Rutherford — By Henry Wright Kerr (1857-1936) - The copyright holder of this file allows anyone to use it for any purpose, provided that the copyright holder is properly attributed. Redistribution, derivative work, commercial use, and all other use is permitted.Royal College of Physicians of EdinburghAjmoore94,
Photo Credit: CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=53208598

Engraved portrait of Rutherford —
Photo Credit: By William Ramsay - The Gases of the Atmosphere (old book), Public Domain, https://commons.wikimedia.org/w/index.php?curid=2682565

Sir Walter Scott — Raeburn's portrait of Sir Walter Scott in 1822
Photo Credit: By Henry Raeburn - Public Domain, https://commons.wikimedia.org/w/index.php?curid=24971320

Catherine I of Russia — By Jean-Marc Nattier
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=2074479

Ludwig I of Bavaria, c. 1830 —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=3182233