Jón Arason was the last Catholic bishop in Iceland before it became a Lutheran country. His story involves a lot of gory details in this story including a pretty gruesome beheading.

Research:

• Buck, Thomas. “An Icelandic Martyr: Jón Arason.” Studies: An Irish Quarterly Review, vol. 46, no. 182, 1957, pp. 213–22. JSTOR, http://www.jstor.org/stable/30103574. Accessed 8 Jan. 2025.
• Cunningham, Jack. “Jón Arason, ‘the last Icelander’ and the Coming of the Reformation to Iceland,” Reformation & Renaissance Review, 11:3, 245-273, DOI: 10.1558/rrr.v11i3.245.”
• Gunnarsson, Gisli. “Question: Is it really true that all Icelanders are descended from Jón Arason, the last Catholic bishop of Iceland, who was executed in 1550?” The Islandic Web of Science. 3/5/2005. https://www.why.is/svar.php?id=4789
• Ker, W.P. “JÓN ARASON.” Saga-Book, 1913-1914, Vol. 8 (1913-1914), pp. 149-171. Via JSTOR. https://www.jstor.org/stable/10.2307/48611694
• Kristjánsdóttir, Steinunn. “The Dissolution of the Monastic Houses in Iceland.” Religions 15: 771. https://doi.org/10.3390/rel15070771
• Oleson, Tryggvi J. “A Note on Bishop Jón Arason.” Speculum , Jul., 1954, Vol. 29, No. 3 (Jul., 1954), pp. 535-536. Via JSTOR. https://www.jstor.org/stable/2846795
• Oleson, Tryggvi J. “Bishop Jón Arason 1484-1550.” Speculum , Apr., 1953, Vol. 28, No. 2 (Apr., 1953). Via JSTOR. https://www.jstor.org/stable/2849686