Prehistoric settlement A
stone axe from the early
Neolithic period was found near Ogmore-by-Sea, suggesting human activity some 6,000 years ago. However the earliest direct evidence of habitation within the community is of two burial mounds from the
Bronze Age, on the limestone hills of Beacons Down (, SS884751). The best preserved, a
scheduled monument, is a low bracken-covered mound on common land near the road at Heol y Mynydd. A group of 5 ploughed-out barrows is also tentatively identified in a field south of St Brides Major village. There are two scheduled monuments from the
Iron Age, both
hillforts: ;Dunraven Castle Hillfort: (, OS grid Ref. SS887727) This is a promontory fort, above the sea on the Trwyn y Witch headland. The northern half of the enclosed area has eroded away, and later castles and then a mansion were built over part of the ramparts. Within the surviving enclosed land there is evidence of 21 roundhouses. ;Promontory Fort on Fleming's Down: (, OS grid ref. SS889768) This inland
promontory fort, is on a natural promontory overlooking the Ewenny valley, at its confluence with the River Ogmore. It has a substantial defensive earthwork enclosing , and it may be that some of the scarp slopes have been steepened for better defence. ;Inhumations: In 1818 workmen cam across three burials with a substantial collection of items from the very end of the Iron Age: knives, spear heads, ornate enamelled helmets, and thick copper skull-caps. The items were recorded at the time, but lost afterwards. There is no scheduled site as the location within the parish was not recorded, although in 2001, Old Castle Down was tentatively identified. Writing in 1925,
Mortimer Wheeler described the finds as "the richest and most remarkable of their kind known to have been discovered in Britain". ;Enclosures: Three Iron Age enclosures are known from
cropmarks, in fields inland from the Trwyn y Witch headland.
Roman period There is very little indication as to Roman period habitation in St Brides Major community. A field system on Beacons Down (, OS grid ref. SS887755) may indicate a farmstead from this period, cropmarks at Pitcot Farm (, OS grid ref. SS887755) have been suggested as being a
Roman villa, and Roman pottery has been found at Castle-upon-Alun (, OS grid ref. SS912744).
Medieval period From the pre-Norman period, two parts of two stone crosses are known. At Ogmore Castle, an 11th-century stone cross fragment was found in 1929. Now in the
National Museum of Wales, this is a wide 'stem' which would once have included a circular cross-head. (See the
Cross of Grutne for a comparable example). It has a tenon at the bottom, for slotting into a base, and has inscriptions on both wide sides. Both are highly abbreviated and abraded, so the transcriptions are speculative in places, but one side may read, [--] EST[--] QUOD DED[IT] ARTHMAIL AGRUM DO ET GLIGUIS ET NERTAT ET FILIE SU[A], which would translate as "Be it [known to all men] that Arthmail gave (this) field to God and Glywys and Nertat and his daughter". The other, even more damaged, may have, [IN NOMINE]/ DI SUM(M)I CRO/S(?) IH(ES)U(?) GENTI/ BRANCUT/ BRANCIE(?)/ [FILI ], "In the Name of the Most High God, the Cross of Jesus for the family of Brancu, (son of) Brancia". ;Croes Antoni: (, OS grid ref. SS893751) This scheduled monument is a heavily weathered socket-stone for a stone cross. It is probably pre-Norman, and is set in the ground beside the road north of St Brides Major village, with an accompanying name plaque. The paucity of early medieval settlement evidence is most probably due to continuity of use. The Iron Age sites may have continued in use well beyond the Roman period, and the later medieval sites are probably built on earlier settlements. Norman features are found in St Bridget's Church and Ogmore Castle. The following are medieval Scheduled Monuments:- ;Ogmore Castle: (, SS881769). The first building was in place by 1117, and included a tidal moat. The stone keep claims to be "one of the oldest Norman stone buildings in South East Wales". ;Ogmore Stepping Stones: (, SS881769). This is a rare survival of a complete medieval stepping stone river crossing. The 33 square blocks provide pedestrian access across the River Ewenny near Ogmore Castle ;Stepsau Duon: (, SS908756)
Stepping stones also called 'Stepson Downs' and 'Pant y Brown', these are 15 stone steps across the Afon Alun, alongside a ford near Castle-upon-Alun. ;Churchyard Cross: (, SS894750) Cross, Medieval stone cross shaft and socket, on a base of six steps, in St Bridget's Churchyard. St Bridget's Church itself, a grade II* listed building, is first documented in 1141, with a Norman chancel arch as its earliest remaining feature. It is now part of a combined parish of Ewenny and St Brides Major, having been the parish church of St Brides Major. Dunraven Castle, a Victorian mansion at Trwyn y Witch headland, was demolished in 1962. Before its development as a castellated mansion it appears to have been a medieval castle, and then a manor house. Although it was within the Norman Lordship of the de Londres of Ogmore, it was granted to the Butler family (or Boteler), reputedly in return for faithful service when Ogmore Castle was under attack. The Butlers have various tombs in St Bridget's Church from the 12th to 16th centuries.
St Brides Major (clustered around St Bridget's Church), Ogmore village (near Ogmore Castle),
Southerndown (on the Dunraven estate), and Castle-upon-Alun (near the castle at Oldcastle-upon-Alun) are the four medieval settlements.
Ogmore-by-Sea, by contrast, is a 19th-century settlement (having been a scatter of three cottages in 1840. Its expansion was due to seaside holiday makers, although it only acquired official recognition as a name in 1920, when St Brides Major parish was divided into three wards, by which time Ogmore-by-Sea was a small but thriving resort. ==Economy==