St. Assicus of Elphin
St. Assicus was the first bishop of Elphin, Ireland, and was a person friend of St. Patrick. Before his conversion by Patrick, Assicus was a metalworker, especially in copper and brass, and likely continued his craft after converting to Christianity, crafting gold chalices and patens and even brass bells for use in the churches. After his death, his successors founded a school of art in his name, and many of the pieces they produced are well-known to this day.