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Catholic Encyclopedia
http://www.newadvent.org/cathen/01617b.htm
St. Apollinaris Claudius, second-century bishop of Hierapolis, apologist.
Catholic Online
http://saints.catholic.org/saints/apollinaris.html
Brief hagiography of St. Apollinaris.
For All the Saints
http://www.saintpatrickdc.org/ss/0108.htm#apol
Short biography of St. Apollinaris of Hierapolis, also known as Apollinaris the Apologist.