What Northumbrian missionary saint studied at Rath Melsigi?
Rath Melsigi:  Among those known to have studied there were Willibrord, Swithbert, and Egbert (639-729), who organised the mission to Frisia. Willibrord: Willibrord (Latin: "Villibrordus" ; 658 – 7 November AD 739) was a Northumbrian missionary saint, known as the "Apostle to the Frisians" in the modern Netherlands.
i don't know