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Ivo of Chartres
http://www.catholic-forum.com/saints/sainti09.htm
Also known as St. Yves or Yvo. Profile.
Ivo of Chartres, Saint
http://www.bartleby.com/65/iv/IvoChart.html
Brief biographical entry in the Columbia Encyclopedia.
St. Ivo of Chartres
http://www.newadvent.org/cathen/08257a.htm
Essay in the Catholic Encyclopedia on the life and writings of this bishop, who died in 1116.