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Catholic Encyclopedia
http://www.newadvent.org/cathen/15639b.htm
St. William of Vercelli, or William of Monte Vergine, founder of the Hermits of Monte Vergine, also called the Williamites, d. 1142.
For All the Saints
http://www.saintpatrickdc.org/ss/0625.htm#will
Biography of St. William of Vercelli.