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Catholic Encyclopedia
http://www.newadvent.org/cathen/05630b.htm
St. Euthymius the Great, abbot in Palestine, d. 473.
Catholic Online
http://saints.catholic.org/saints/euthymius.html
Almost an itinerary rather than a biography.
For All the Saints
http://www.saintpatrickdc.org/ss/0120.htm#euth
Biographical essay on St. Euthymius the Great.
The Ecole Glossary
http://www2.evansville.edu/ecoleweb/glossary/euthymiosgr.html
Short biography of St. Euthymius the Great, by Karen Rae Keck.