Ælla's execution of Ragnar Lodbrok — By Hugo Hamilton (1802–1871) - Hamilton, Hugo. 1830. Teckningar ur Skandinaviens Äldre Historia. Stockholm: Gjöthström & Magnusson. Digitalized by Martling Bok & Grafik
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=5286286