Born to the nobility, the family of the Count of Seyne (an area of modern Germany). Many of the noble families sought the girl for an arranged marriage, but Mary was drawn to religious life with a special devotion to the Mother of God. She entered the Premonstratensians and became canoness at the convent of Dünnwald at Cologne, Germany where she spent her days in charitable work, spiritual reading and prayer.
- 1200 of natural causes
- Book of Saints, by the Monks of Ramsgate
- Den katolske kirke
- Our Sunday Visitor’s Encyclopedia of Saints
- “Saint Mary of Seyne“. CatholicSaints.Info. 7 March 2010. Web. 21 January 2017. <>