The community of Llawhaden includes the parish of Robeston Wathen, part of Narberth and the hamlet of Gelli, and had a population of 634 in 2001, increasing to 688 at the 2011 Census.

[3] As Marcher Lords, the Bishops of St Davids had judicial powers over all offences (except high treason), and could levy tax, issue charters, raise armies, and start wars.

As the lands north of the Preseli Hills were less fertile, and hence less hospitable, than those to the south, successive bishops came to base their administration at Llawhaden;[3] by the 13th century the exchequer, chancery and court of Dewisland had moved here.

[6] The Eastern Cleddau formed the linguistic boundary, which has been fairly stable since Norman times, although, perhaps in the early Industrial Revolution when people moved to seek work, Welsh-speakers started emerging in the area around Gelli woollen mill.

Llawhaden Bridge, to the east of the village, spans the Eastern Cleddau and is a Grade II* listed structure built in the mid-18th century.