St. John on Patmos

17th century
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Nizhny Novgorod Art Museum

John receives his inspiration from the (unseen) angel above and dictates to his assistant, the deacon Prochorus. In the red disc at the top is a lion, John's attribute in some eastern, and especially Russian, images.

Read more about images of St. John the Evangelist.

Source: this page at Wikimedia Commons.