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Catholic Encyclopedia
http://www.newadvent.org/cathen/13214a.htm
St. Ruadhan, Irish founder of the monastery of Lorrha, one of the "twelve apostles of Erin", d. 584.
For All the Saints
http://www.saintpatrickdc.org/ss/0415.htm#roda
St. Ruadhan is also known as St. Rodan or Ruadan.