Chiron Teaching Medicine to Asklepios, from an illustrated Byzantine manuscript of Plutarch 73 cod. 16, ca. 1250 CE.
Source: Vail/Sailko via Wikimedia Commons [CCA 3.0]
ttps://commons.wikimedia.org/wiki/File:Italia_meridionale,_miscellanea_medica,_1250_ca.,_pluteo_73.16,_02_chirone_cropped_white-balanced.png
THE SHIELD OF ACHILLES 
Here “Plut.” is an abbreviation for “Pluteo” (bookshelf) not “Plutarch”.
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You may want to research the reference source. In fact, this illustration is published in a Byzantine-era translation of Plutarch’s Lives, specifically referencing Chiron as a teacher of the arts and medicine. The original image source on Wikimedia shows the illustration in context. It’s found on a page illustrating “Chiron Teaching Medicine to Asklepios, from an illustrated Byzantine manuscript of Plutarch 73 cod. 16, ca. 1250 CE. From the Biblioteca Medicea Laurenziana” – https://commons.wikimedia.org/wiki/File:Italia_meridionale,_miscellanea_medica,_1250_ca.,_pluteo_73.16,_02_chirone.JPG
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Some additional interesting reading on Chiron, “A Newly Discovered Textual Source for the Master of the Orpheus Legend’s Chiron Plaquettes” at link https://www.journals.uchicago.edu/doi/full/10.1086/695753#fn15 offers this reference to Chiron teaching Asklepios medicine: 15. Pliny the Elder, Natural History, vol. 2, trans. H. Rackham (Cambridge, MA: Harvard University Press, 1961), book 7, 197: “the science of herbs and drugs was discovered by Chiron the son of Saturnus [Kronos] and Philyra.” Homer, Iliad, trans. Richmond Lattimore (Chicago: University of Chicago Press, 1961), book 4, 215–19: “In skill he [Machaon, son of Asclepios] laid healing medicines on it [Menelaus’ wound] that Kheiron in friendship long ago had given his father [Asclepios].”
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