What is "eglwyswen"

Eglwyswen (sometimes called Whitechurch or Whitchurch-by-Cardigan) is a scattered rural settlement and parish in Pembrokeshire, Wales. It is on the north slopes of the Preseli Hills, northwest of Crymych. The south-western part of the parish is in the Pembrokeshire Coast National Park and includes the settlements of Pontyglasier and Penygroes. The parish is part of the community of Crymych.