St. John Cantius (also known as St. John of Kanty) was a priest of the diocese of Cracow, Poland, and a professor of philosophy and Sacred Scripture of the university there. He was highly esteemed not only for his scholarship, but for his personal holiness which endeared him to the entire university community.
His humble and mortified life also endeared him to the largely forgotten poor, to whom he manifested great love and respect. He exhorted his students and fellow professors as well to fight error but not persons, saying that roughness would only discredit the message of the truth.
One of Poland’s patron saints, he died in 1473.