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 situated in the Vale of Cothi, in Cantref Mawr, and far south of the county boundary of the Teifi, were sometimes spoken of as being in Cardiganshire (Ceredigion). The "Chronicon" of Adam of Usk states that the cwmwd of Caio (properly Cynwyl Caio) was situated ""in Comitatu di Cardikan"." In the Charter of Talley Abbey, Brechfa is also spoken of as ""Lanteilau Brechfa apud Keredigaun"." These statements may be simply mistakes, or they may be echoes of the fact that the kings of Ceredigion conquered Y Cantref Mawr in, the eighth century. The same authority on Welsh topography also deals