James Fegan (born abt 1825) and Elita Fenton (born abt 1825)were married at St Paul's Church in Dublin on 4 Jan 1847. She gave birth to Patrick in 1850.and sometime around 1855 they moved to NYC. Patrick shows in the US census until 1870 (as a manufacturer of hats) and when James dies in NJ in 1899 he's listed in the will as being in Dublin.
Hi Jill
St Paul's Church (Old Glasnevin) is located on Arran Quay near North King Street in inner-city Dublin.
Your ancestors most likely lived in the vicinity of https://irelandxo.com/ireland/dublin/st-pauls-dublin