- Catholic Encyclopedia - SS. Mark and Marcellian, blood brothers martyred at Rome in the Diocletian persecution, probably in 286.
www.newadvent.org/cathen/09682a.htm
- For All the Saints - Essay on SS. Mark and Marcellian, twins, both of whom were married deacons.
users.erols.com/saintpat/ss/0618.htm#mark
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