May 17 (Eastern Orthodox liturgics) - Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/May_17_(Eastern_Orthodox_liturgics)
May 16 - Eastern Orthodox Church calendar - May 18. All fixed commemorations below ... Saint Gerebernus (Gerebern, Gerebrand), Hieromartyr, priest from Ireland who accompanied St Dymphna to Belgium and shared in her martyrdom ...
Orthodox Western Saints for Today - 17th May - Dr. John Hutchison-Hall
www.drjohnhutchisonhall.com/Saints/17_May.htm
GEREBERN (GEREBRAND), a seventh century priest from Ireland who accompanied St. Dympna (15th May) to Gheel, and shared in her martyrdom.