Could someone point me in the right direction for finding a marriage certificate for Catherine Fitzgerald (1824 Ireland) & Daniel Costigan (1819 Ireland) who were married on December 25, 1850 by a Roman Catholic priest in Cardiff, South Wales. This couple left within 2 years of their marriage for the U.S. where Daniel fought in the civil war. I got the marriage information from the civil war pension record that Catherine filled out. Any help would be most appreciated.