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Latitude: 51.8604 / 51°51'37"N
Longitude: -3.1376 / 3°8'15"W
OS Eastings: 321754
OS Northings: 218592
OS Grid: SO217185
Mapcode National: GBR F0.SY3Q
Mapcode Global: VH6CH.KHMN
Entry Name: Porth Mawr
Source ID: 786
Cadw Legacy ID: BR114
Schedule Class: Domestic
Period: Post Medieval/Modern
Community: Crickhowell (Crughywel)
Built-Up Area: Crickhowell
Traditional County: Brecknockshire
The monument consists of the remains of a 15th century gatehouse with a single carriageway and room above. The gateway is positioned within a stone embattled wall and is turreted in a Tudor style. It has Tudor arches and an upper chamber lit by two hooded windows, an octagonal chimney and a battlement parapet. A spiral staircase leads to the first floor and the roof on the NE corner of the gatehouse, is lit by a small rectangular window and exits to the roof from a stair turret. In the interior the ribbed vault with bosses is of early 19th century date. The arch facing the road has weather mouldings, hood and stops, while the house-facing arch is chamfered. The gateway was built by the Herbert family during the reign of Henry VIII as the entrance to their mansion, Cwrt Carw. The Tudor mansion was demolished in the early 19th century and replaced by a Regency style manor house.
The monument is of national importance for its potential to enhance our knowledge of entrance architecture. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. The structure itself may be expected to contain archaeological information concerning chronology and building techniques. A gatehouse may be part of a larger cluster of monuments and their importance can further enhanced by their group value.
The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.