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Catholic Encyclopedia
http://www.newadvent.org/cathen/01032a.htm
SS. Abdon and Sennen. Persian martyrs in the Decian persecution. Died in about 250. Abdon is also called Abdo or Abdus; and Sennen is also known as Sennes, Sennis, or Zennen.
For All the Saints
http://www.saintpatrickdc.org/ss/0730.htm
Hagiography of SS. Abdon and Sennen.
Patron Saints Index: Abdon
http://www.catholic-forum.com/saints/sainta52.htm
Profile of St. Abdon.
Patron Saints Index: Senen
http://www.catholic-forum.com/saints/saints17.htm
Profile of St. Senen.