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Catholic Encyclopedia
http://www.newadvent.org/cathen/06537a.htm
SS. Gervasius and Protasius were martyred in Milan, probably in the second century.
Catholic Online
http://saints.catholic.org/saints/gervase.html
Summary of the story of SS. Gervasius and Protasius.
For All the Saints
http://www.saintpatrickdc.org/ss/0619.htm#gerv
Essay places SS. Gervasius and Protasius (or Gervase and Protase) in the second century.
St. Ambrose: Letter XXII
http://www.ccel.org/fathers2/NPNF2-10/Npnf2-10-51.htm
In a letter to his sister, St. Ambrose tells of the discovery of the relics of Gervasius and Protasius. Also includes sermons delivered on the occasion.