Lloyd family

hi everybody I am Andrea from Manchester England I am doing my ancestry and have become stuck my 4th great grandmother was kata Anna ormsby and she married a John yeadon (yaden)owen Lloyd in 1847 in Donamon Gal  my grandmother some how moved to Liverpool and I can find her marriage to my 4th great grandfather Samuel Roberts..I am so intrigued about her life married to her 1st husband in Ireland all I have is there marriage certificate and there parents name..and on the census records it says born Roscommon Ireland..I am rubbish with geography so is the place they got married in Roscommon or near there. Any help would be greatly appreciated..thanx