Ceredigion (UK Parliament constituency) towns which comprised the Boroughs varied slightly over this long period, but primarily consisted of Cardigan, Aberystwyth, Lampeter and Adpar, the latter now a suburb of Newcastle Emlyn across the Teifi, in Carmarthenshire. The county constituency (for the purposes of type of returning officer and electoral expenses) was enlarged in 1983 with the addition of part of Pembrokeshire, being renamed Ceredigion and Pembroke North. In 1997 it reverted to its former boundaries, being renamed Ceredigion. The Ceredigion Welsh Assembly constituency was created with the same boundaries in 1999. Since 2017 the seat has been held in Parliament by Ben Lake
Kingdom of Ceredigion a part of southern Ceredigion was in the territory of the Demetae and possibly part of that of the Ordovices. In post-Roman times, however, there is no evidence that the Kingdom of Dyfed included any part of Ceredigion. Modern Ceredigion corresponds almost exactly to the ancient kingdom of Ceredigion. This name is derived from an adjective Cereticianus, itself a derivative of the proper name Cereticus (Cere- dig), known as the son of Cunedda. Though modern Ceredigion corresponds very closely to the old kingdom of Ceredigion, yet it would appear that, in the thirteenth and fourteenth centuries, certain places in Carmarthenshire,