Abstract
Pope John XXI was an ophthalmologist before becoming Pope. He was born in Lisbon and trained at University of Paris and was part of the early medical school faculty in Siena. He became physician for Pope Gregory X and shifted to church duties. He rose quickly in the ranks of the Catholic church and was elected Pope in 1276 AD. His term was short. He died when construction in the Papal Palace at Viterbo, collapsed on him. His text book is in two parts with introductions to the eye followed by descriptions of diseases with their mostly medical treatments. He concludes with a section about his own wonderful waters. The work survived and a copy was even found amongst Michelangelo's papers. Unfortunately the book turns out to be a plagiarism of two earlier text books. His most notable achievement supposedly was discovering that glaucoma was a disease with a hard eye. It turns out that this section is referring only to a suppurative external disease with indurated lids called sclerophthalmia.
Similar content being viewed by others
References
Davidson M. Petrus Lusitanus. Arch Ophthal. Vol. 688, 1962, pp 290–291.
Walsh J. Pope John XXI, the Ophthalmologist Pope. Ophthalmology 5: 1908–1909; pp 236–246.
Constantine. Liber de Oculis. Librairie J.B. Baillière et fils 1909–1933.
Hirschberg J. History of Ophthalmology. Blodi F., translated into English Vol 1, 11 part II Wayenborgh, 1982.
Hunain Ibn Hâq. Ten Treatises. Meyerhof M, translated into English, Government Press, Cairo 1928.
Mann H, and Hollnsteiner J. Lives of the Popes Vol XVI Kegan Paul, Trench, Trubner and Co. Ltd. St. Louis, Mo. 1932, pp 31–56.
Petrus Hispanus. Liber de oculo. Berger AM, translated into German, Lehmann, München, 1899.
Petrus Hispanus (Peter of Spain). Summulae Logicales. Translated into English, Mullally J. Notre Dame, Indiana 1945.
Petrus Hispanus (Hispano, Pedro). Thesaurus Pauperum. Acta Universitatis Conimbrigensis, Maria Helena da Rocha Pereira.
Walsh James. The Popes and Science. Fordham University Press, New York, 1911, p. 207.
Zacharie, Magistri. Tractatus de Passionibus Ocularum. Librairie JB Baillière et fils, 1907.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Blanchard, D. Pope John XXI, ophthalmologist. Doc Ophthalmol 89, 75–84 (1995). https://doi.org/10.1007/BF01203402
Issue Date:
DOI: https://doi.org/10.1007/BF01203402