Adpar, formerly Trefhedyn, is a village in Ceredigion, Wales, in the community of Llandyfriog, now considered as a part of Newcastle Emlyn to which it is joined by a bridge across the River Teifi.

[1] The Royal Commission on the Ancient and Historical Monuments of Wales records a "possible medieval castle motte" within the village.

Several industrial enterprises used the fast-flowing waters of the River Teifi for power, including a woollen mill that produced flannel, blankets and knitting yarn.

[3] The first permanent printing press was established in Adpar in 1719 by Isaac Carter (printer and native of Carmarthenshire).

It is believed that the first two publications from this press were Welsh language Cân o Senn i’w hen Feistr Tobacco ("song from Senn to his old master, tobacco") by Alban Thomas and Cân ar Fesur Triban ynghylch Cydwybod a’i Chynheddfau ("Song in triplet measure concerning conscience and its qualities").