- James Lacop
- Jaak Lacops
Norbertine monk at Middelburg, Belgium. In 1566 he apostatized, writing and preaching against the Church. He later repented, rejoined his order, and retired to his abbey to do penance. One of the Gorkum Martyrs.
- Book of Saints, by the Monks of Ramsgate
- Martirologio Romano, 2005 edition
- Our Sunday Visitor’s Encyclopedia of Saints
- Roman Martyrology
- “Saint Jacobus Lacops“. CatholicSaints.Info. 25 November 2016. Web. 26 April 2017. <>