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Catholic Encyclopedia
http://www.newadvent.org/cathen/14003a.htm
SS. Simplicius, Faustinus, and Beatrice, two brothers and their sister, all martyrs in the Diocletian persecution.
For All the Saints
http://www.saintpatrickdc.org/ss/0729.htm#simp
Hagiography of SS. Simplicius, Faustinus, and Beatrice.