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Catholic Encyclopedia
http://www.newadvent.org/cathen/12427a.htm
SS. Primus and Felician were among the martyrs of the Diocletian persecution, in about 304.
For All the Saints
http://www.saintpatrickdc.org/ss/0609.htm#feli
Paragraph reporting on the admittedly untrustworthy acta of SS. Primus and Felician.