Letter XXII - 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. - http://www.ccel.org/ccel/schaff/npnf210.v.viii.html
St. Gervase - Summary of the story of SS. Gervasius and Protasius. - http://www.catholic.org/saints/saint.php?saint_id=440
Gervase and Protase - Essay places these saints in the second century. - http://www.saintpatrickdc.org/ss/0619.htm#gerv
Sts. Gervasius and Protasius - Martyred in Milan, probably in the second century. - http://www.newadvent.org/cathen/06537a.htm