There was a soldier named John Ryan born circa 1832 who said he was born in the parish of Posttown near Clonmel, Tipparary. I think it is a corruption of Powerstown.
Hello -Possibly Portadown misheard.craggagh.
Do you know her maiden name or her husband's name?If so try https://civilrecords.irishgenealogy.ie/churchrecords/civil-search.jsp which is free.If R.C they start 1864as per https://www.irishgenealogy.ie/en/civil-records/help/what-civil-records-are-on-lineJust put the name in, year range and tick Marriages leave District empty.you have to solve captcha security and enter your name, then you get list of Marriages for that name within time frame.or for Births tick Births and Year Range adapt search terms.