Priest. Teacher. Prior. Known to have had a great devotion to Our Lady. Delegate from emperor to the papal court. Worked for the union of the Greek and Latin Churches. When he became persecuted by the Patriarch of Constantinople, he retired to Mount Carmel and became a Carmelite. Prior of three years, and chosen General of the Carmelites. Had the gift of prophecy. Wrote a work on the procession of the Holy Ghost. Earlier writers often confused him with Saint Cyril of Alexandria.
- 1224 of natural causes
- Book of Saints, by the Monks of Ramsgate
- Catholic Encyclopedia
- New Catholic Dictionary
- Our Sunday Visitor’s Encyclopedia of Saints
- “Saint Cyril of Constantinople“. Saints.SQPN.com. 20 February 2014. Web. 25 January 2015. <>