Today is the feast of St John Cantius (1390-1473), a priest of the diocese of Krakow, Poland, who spent most of his life as a professor at the Krakow Academy, which is now known as the Jagiellonian University, and counts the astronomer Copernicus and Pope St John Paul II among its other illustrious alumni. The revised Butler’s Lives of the Saints recounts two beautiful traditions of the
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