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Ante-Nicene Fathers
http://www.ccel.org/fathers2/ANF-08/anf08-166.htm
Brief biography of Dionysius of Corinth, and fragments from a letter to the Roman Church. In Ante-Nicene Fathers (American edition), vol. 8.
Catholic Encyclopedia
http://www.newadvent.org/cathen/05010a.htm
St. Dionysius, bishop of Corinth in about 170.
For All the Saints
http://www.saintpatrickdc.org/ss/0408.htm#dion
Biographical portrait of St. Dionysius of Corinth, bishop and confessor.