Southwest Wales is very rich in Norman Castles. Some are deep within the Welsh zone (e.g. Newport, Cardigan, Cilgerran, Newcastle Emlyn, Carmarthen), and some are deep in Little England (e.g. Pembroke, Carew, Manorbier, Haverfordwest, Tenby). A number lie close to the language boundary (e.g. Roch, Wiston, Llawhaden, Narberth, Laugharne) and are sometimes referred to as “frontier castles”, but the whole of Dyfed (the territory south of the River Teifi and west of the Towy and Gwili) was in the hands of Norman marcher lords.