Scheduled Monuments in Pembrokeshire along with a wide variety of post-medieval sites from coalmines, kilns and dovecotes through to World War II defensive structures. Scheduled Ancient Monuments (SAMs) have statutory protection. The compilation of the list is undertaken by Cadw Welsh Historic Monuments, which is an executive agency of the National Assembly of Wales. The list of scheduled monuments below is supplied by Cadw with additional material from Royal Commission on the Ancient and Historical Monuments of Wales and Dyfed Archaeological Trust. Scheduled Monuments in Pembrokeshire Pembrokeshire is the fifth-largest county in Wales, but has more Ancient Monuments (526) than any except Powys. This
Pembrokeshire have developed along the Milford Haven Waterway and the county has attracted other major ventures. In 2016, the Rt. Hon. Stephen Crabb, then Welsh Secretary, commented in a government press release: ""...with a buoyant local economy, Pembrokeshire is punching above its weight across the UK."" Until the 12th century, a great extent of Pembrokeshire was virgin woodland. Clearance in the lowland south began under Anglo-Flemish colonisation and under mediaeval tenancies in other areas. Such was the extent of development that by the 16th century there was a shortage of timber in the county. Little is known about mediaeval farming methods,