|Possible road: NW (19) to Moridvnvm
Possible road: E (11) to Nidvm (Neath, West Glamorgan)
|SS564980||c.535 x 410 ft
(c.163 x 125 m)
The first mention of the Roman name for the Loughor fort appears in the Antonine Itinerary, published in the late-2nd century. The Twelfth Itinerary in the British section of this document details the route between Carmarthen in Dyfed and Wroxeter in Shropshire. The first stage of this route is a station named Leucarum, situated some 15 miles from Moridunum (Carmarthen) and another 15 miles from the next changing-post or mutatione at Nidum (Neath, West Glamorgan).
This evidence is supported by the seventh century Ravenna Cosmology, where, appearing among the rivers of South Wales is the name Leuca (R&C#246), between the entries for the Aventio (Afon Ewenny, Glamorgan) and the Stuctia or Juctius (Afon Ystwyth, Dyfed).
Due to the hilly nature of the terrain in this part of South Wales, and the position of this fort situated at the mouth of the Leuca Fluvius (Afon Llwchwr/River Loughor; see Ptolemy), it is possible that this fort was originally supplied by sea from Nidum (Neath), or directly from the Legionary Fortress at Isca (Caerleon).
Although a bath-house discovered in 1851 confirmed a Roman presence in the area, the actual location of the suspected garrison fort was not established until 1969 when excavations on the site of the Norman motte revealed the eastern corner-angle of the Roman fort lying beneath the later castle mound. Investigations over the following year located and confirmed the position and orientation of the north, south and east ramparts, but the the western defences lie somewhere beneath the railway embankment, which curves around the Norman castle and the church to the south and west.
Traces of an angle-tower in the eastern corner of the fort were uncovered beneath the castle motte during excavations in 1969/70. Investigations on the site of the northern corner-angle revealed no corresponding tower in this location but did afford a decent section across the fort's defences, where three main phases of construction were apparent.
Six phases of interior buildings were discerned immediately behind the rampart; no trace of an intervallum road being found. Two trenches dug in the gardens of Station House in 1971 with the intention of finding the south-western defences, instead revealed the post-holes and sleeper-trenches of more buildings. If these buildings were inside the fort - which appears likely - this must mean that the defences lay further to the west, and therefore enclosed an area in excess of 5 acres (2 ha). It is possible, however, that the fort was not rectangular in plan, but that the northern defences ran along the river-bank, thus giving a trapezoid, almost triangular outline with a loss of about half an acre of internal area.
The original (timber-built) fort measured around 410 feet (c.125 m) NNW-SSE but the transverse dimension, the major axis of the fort, remains uncertain. Original defences consisted of a single ditch only 4½ feet (c.1.4 m) deep, backed by a substantial rampart of turf and clay set on a foundation of cobbles some 30 feet (c.9.4 m) thick. At some point (possibly in the early-2nd century) the primary ditch was back-filled in order for the front of the rampart to be revetted with a stone wall 3¼ feet (c.1 m) thick. Corner turrets of stone were included at the same time, along with two shallow secondary ditches, the inner measuring 8 ft across, while the outer was 5½ ft (c.2.5 + 1.7 m). These ditches were filled-in and covered with a thick layer of clay sometime during the 3rd century.
The fort has not been dated, but unstratified Flavian samian-ware indicates that occupation began in the late-1st century AD. Pottery found during excavations in 1969-70 ranged from c.AD75 to 130, and coins of Gallienus and Constantine were found in the last-identifiably Roman occupation layer, possibly indicating that the fort was abandoned before the early-4th century.
There are a few so-called "military practice works" nearby, one at Stafford Common (SS5997) and another two at Pen-y-waun on Mynydd Carn-goch (SS6097). In addition, there is a substantial Roman building six miles to the south at Mumbles on the coast (SS6188).
Antonine itinerary: 12-11 Leucaro