Eighth century Frankish courtier. Brother of Saint Nivard. Married to Saint Bertha of Avenay. With Bertha‘s approval, he separated from her to become a monk. Travelled to Ireland where he was martyred by pagans attacking his monastery.
- in Ireland
- Book of Saints, by the Monks of Ramsgate
- Celtic Saints
- Medieval Religion Listserv, by Terri Morgan
- Our Sunday Visitor’s Encyclopedia of Saints
- “Saint Gundebert of Gumber“. Saints.SQPN.com. 2 March 2014. Web. 27 January 2015. <>