Llanybri developed, under the ownership of the Lords of Llansteffan and Penrhyn, around a central open area of common land and a chapel dedicated to St Mary.

The Holy Trinity Church and a non-conformist chapel were built in the 19th century[1] at opposite ends of the village.

The writers Lynette Roberts and Keidrych Rhys lived in the village.

Dylan Thomas was a frequent visitor to the village pub, the Farmers' Arms, both when he lived near Llansteffan and in Laugharne.

[3] Thomas' maternal aunt, Anne Gwyn, once lived in Plas Uchaf, while one of his great-aunts had lived in Plas Isaf.