In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Llangoedmor like this:
LLANGOEDMORE, or LLANGoEDMAWR, a parish in the district and county of Cardigan; on the river Teifi and on the Cardigan railway, at the boundary with Pembroke, 1 mile E by S of Cardigan. Post town, Cardigan. Acres, 4,946. Real property, with Llechryd, £5,040. Rated property of Llangoedmore alone, £3,775. ...
Pop. in 1851,990; in 1861,902. Houses, 217. The property is divided among a few. The manor belonged to the Langleys; passed to the Mortimers and the Lewises; and belongs now to the Lloyds. Coedmore, in a charming situation, nearly opposite Cilgerran Castle, is the seat of T. E. Lloyd, Esq.; and Llangoedmore, of Mrs. Millingchamp. Trevorgan also is a chief residence. Slate is found. A well and a cave called St. Cynllo's, are near the church; and there are some Druidical stones. A battle was fought, in 1135, near Crugmawr, between Gruffydd ab Rhys and the English. The living is a rectory in the diocese of St. David's. Value, £440. Patron, R. D. Jenkins, Esq. The church is dedicsted to 8.5Cynllo; was repaired in 1830; and was restored in
GB Historical GIS / University of Portsmouth, History of Llangoedmor, in Ceredigion and Cardiganshire | Map and description, A Vision of Britain through Time.
Date accessed: 23rd March 2017
Click here for more detailed advice on finding places within A Vision of Britain through Time , and maybe some references to other places called " Llangoedmor ".