- Catholic Encyclopedia - St. Ives, or Yves, patron saint of lawyers, d. 1303.
www.newadvent.org/cathen/08256b.htm
- For All the Saints - Brief biography of St. Ivo Hélory, also known as St. Ybus.
users.erols.com/saintpat/ss/0519.htm#ybus
- Patron Saints Index - Profile of St. Ivo of Kermartin, also known as Yvo of Helory. Illustrated.
www.catholic-forum.com/saints/sainti08.htm
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