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Catholic Encyclopedia
http://www.newadvent.org/cathen/11251a.htm
St. Omer, Swiss-born bishop of Terouenne in Belgic Gaul, founder of a monastery. He died in about 670.
For All the Saints
http://www.saintpatrickdc.org/ss/0909.htm#omer
Biography of St. Omer, also known as St. Audomarus, monk and bishop.