Marx, Engels, and Marx' daughters — Karl Marx (1818–1883), Friedrich Engels (1820–1895), and Marx's daughters: Jenny Caroline (1844–1883), Jenny Julia Eleanor (1855–1898), and Jenny Laura (1845–1911). Photograph c. 1864.
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=1417144

Jenny von Westphalen in the 1830s —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=107371886

The Electoral Palace, the main building of the University of Bonn —
Photo Credit: By I, Der Wolf im Wald, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=2462942

seal of the University of Bonn —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=65121673

Karl Marx, 1875 —
Photo Credit: By John Jabez Edwin Mayal - International Institute of Social History, Public Domain, https://commons.wikimedia.org/w/index.php?curid=591288

Gustav IV Adolf of Sweden —
Photo Credit: By Per Krafft the Younger - Public Domain, https://commons.wikimedia.org/w/index.php?curid=276930

Sophia Magdalena, 1765 —
Photo Credit: By Carl Gustaf Pilo - Public Domain, https://commons.wikimedia.org/w/index.php?curid=3820084

Gustav III —
Photo Credit: By Alexander Roslin - Public Domain, https://commons.wikimedia.org/w/index.php?curid=80450534

Adolf Frederick, King of Sweden —
Photo Credit: By Gustaf Lundberg - Public Domain, https://commons.wikimedia.org/w/index.php?curid=15395830

Louisa Ulrika of Prussia, 1720-1782 —
Photo Credit: By Ulrika Pasch - Public Domain, https://commons.wikimedia.org/w/index.php?curid=52135538

Frederick I of Sweden —
Photo Credit: By Martin van Meytens - Public Domain, https://commons.wikimedia.org/w/index.php?curid=1488867