Francisco de Herrera the Elder
St. Catherine Appearing to the Prisoners
Oil on canvas
Bob Jones University, Greenville, South Carolina
The painting's title was provided by the authoritative Web Gallery of Art, but there is no account in the Golden Legend of any apparition by Catherine to prisoners. Most likely what is shown here is the episode in which the imprisoned Catherine is visited by the Emperor's wife, her "prince of knights" named Porphyry, and 200 other knights. Her preaching is said to have converted them all.
More of St. Catherine of Alexandria
Source: Wikimedia Commons