Greg, why are you waiting for reparations? After 6 years working in Ireland as herdsman St Patrick escaped and persuaded a sailor to bring him back to Britain. Afterwards he returned to Ireland as bishop and ended his life there. Since he was son of a local decurio, he could have been of Roman stock.
By the way:
St George who in XIV cent. replaced St Edward the Confessor as patron of England has nothing to do with George of Cappadocia (bishop of Alexandria, Arian = heretic!). He is said to have suffered before Constantine's reign in Lydda (31.57 N 34.54 E).
St Andrew, brother of St Peter, is also patron of Greece and Russia.
About St David's origins nothing much is known; but all are sure that he was Welsh.
All this wisdom excerpted not from longwinded German dictionaries, but from the refreshingly concise Oxford Dictionary of the Christian Church.

Wilfried