Saint Vincent Madelgarus

Belgian sources sthat that Vincent Vadelgarus was born in Strépy, Belgium, sometime in the late 6th or early 7th century; died 677 in Soignies; and was a Benedictine monk who established two monasteries in Hainaut. One of these was at Hautmont (now in France), the other at Soignies.

Madelgarus was sent by Dagobert I to Ireland. His wife was Waltrude.

However, according to John O'Hanlon, his real name was Maelceadar (Mael Ceadar), he was a Count of Hainault, and he was a native of Ireland.

http://en.wikipedia.org/wiki/Vincent_Madelgarus