Kingdom of Dyfed

The A478 road is a major road in Wales. The route is from its junction with the A487 at Cardigan, Ceredigion, to Tenby, Pembrokeshire. It crosses the Preseli Hills and winds through farmland for almost all of its route. The road just touches the very west of Carmarthenshire.

Cilymaenllwyd is a community on the extreme northwest of Carmarthenshire in Wales. The community population at the 2011 census was 742. It lies about 25 miles (40 km) west of Carmarthen, 12 miles (19 km) southeast of Fishguard and 15 miles (24 km) northeast of Haverfordwest. The A478 road runs through the community.

The Hundred of Dungleddy was a hundred in the centre of Pembrokeshire, Wales. It had its origins in the pre-Norman cantref of Deugleddyf. It derives its Welsh name from its position between the two branches of the River Cleddau (Cleddyf): the English form is a corruption of the Welsh. The area of the cantref was around 185 km2: it was the smallest of the seven cantrefi of Dyfed. The cantref was allegedly divided into two commotes. The Red Book of Hergest calls these "Castell Hu" (= modern Cas-wis or Wiston) and "Llan y Hadein" (=Llanhuadain or Llawhaden). These both appear to be post-Norman lordships and are not genuine native subdivisions. The western part of the hundred was English-speaking from the time of the Norman conquest, and formed part of Little England beyond Wales: the eastern part was part of the Lordship of the Bishop of St David's, and George Owen described it as bilingual. The three northeastern parishes of Llys y Fran, New Moat and Bletherston were Welsh-speaking during the 20th century. As their names imply, the civil headquarters of the commotes were at Wiston and Llawhaden, and the latter the cantref's ecclesiastical centre, perhaps the seat of a bishop during the Age of the Saints.Dungleddy was formalised as a hundred by the Laws in Wales Acts 1535-1542: a small part was transferred to the hundred of Dewisland, and various fragments of church land (Llandissilio, Llanfallteg, Llangan, Crinow, Henllan, Grondre and western Llawhaden) were acquired from Cantref Gwarthaf. The name continues in the present day as Daugleddau, a Church in Wales parish in the Diocese of St Davids, combining 13 former Anglican parishes of Pembrokeshire.

Login is a hamlet in Carmarthenshire, Wales, in the Taf valley and sits on both sides of the meandering River Taf. A stone bridge crosses the river approximately 100 metres from a ford near the weir, which used to be the original crossing place. The postal address of Login covers a larger area than that bounded by the village signs. The district is called Cilymaenllwyd, and the main chapel for the region called Calfaria is located in the village. The region of Login consists of streams and valleys and hills, with a sparsely populated community. Cardi Bach ('little Cardi') was the local name given to the Whitland and Cardigan Railway that once ran alongside the River Taf between the towns of Whitland and Cardigan. The railway was closed in 1963 under the Beeching initiative. The Landsker Borderlands Trail, a public route for walkers, passes through Login. Some of the members of the Rebecca fraternity, active in the Rebecca Riots, were resident in Login. One of the hills is named "Radical Hill"; maybe this is in reference to the rebels, or perhaps it refers further back, to the stones deposited from the glaciers that once scoured this valley.The village is known for its wildlife: herons, kingfisher and otters are sometimes seen on the river. Red kites and owls occupy the air at different times of day and night, and several types of bats have been recorded at dusk and dawn.

Llangolman () is a village and parish in the southeastern Preseli Hills in Pembrokeshire, Wales. It is part of the community of Mynachlog-ddu. There are prehistoric remains nearby and the parish has a history of slate and clay quarrying.

Login Halt railway station served the hamlet of Login, Carmarthenshire, Wales, from 1875 to 1962 on the Whitland and Cardigan Railway.

Mynachlog-ddu (SN143306) is a village, parish and community in the Preseli Hills, Pembrokeshire, Wales. The community includes the parish of Llangolman.

Llandissilio is a village and parish in the community of Llandissilio West in east Pembrokeshire, Wales on the A478 road between Efailwen to the north and Clunderwen to the south. A largely ribbon development along the main road, the village is surrounded by farmland.

The Preseli transmitting station (formerly spelt Presely) is a broadcasting and telecommunications facility on the eastern end of the Preseli Mountains, close to the villages of Crymych and Pentre Galar in Pembrokeshire, Wales (grid reference SN172306). It is owned and operated by Arqiva. It has a 235.4-metre (772 ft) high guyed steel lattice mast. It was constructed in 1962 by the IBA to transmit ITV 405-line television with transmissions commencing on Band III channel 8 from antennas at 559 m (1,835 ft) above sea level. The triangle of antenna arrays aimed beams of signal towards Pembrokeshire, another lobe was directed towards western Carmarthenshire and a northward beam covered south western Cardiganshire. The northward beam from the site also fed the transmitter at Arfon in North Wales. The Welsh region ITV programming was initially provided by Teledu Cymru which was taken over by TWW in 1964, and eventually HTV Wales who took over from 1968. In 1971, three protesters from Cymdeithas yr Iaith Gymraeg were jailed for "conspiring to trespass" after gaining access to the site compound and climbing the lower section of the mast. This was part of a series of protests in Wales aiming to get a dedicated Welsh-language TV channel established. The campaign was eventually considered to have been mostly successful with the establishment of S4C (Sianel 4 Cymru) eleven years later. The site was uprated in 1973 to transmit UHF 625-line PAL analogue television channels, starting with BBC1, BBC2 and HTV Wales, with S4C being added in late 1982. The VHF channel 8 transmissions were discontinued in January 1985 as 405-line TV in the UK was phased out. Channel 5 started analogue TV transmissions in 1997. Six digital TV multiplexes were added in 1998 and the site kept this configuration until 2009, when all analogue television signals were permanently switched off. The mast also carries Classic FM on 100.5 MHz and Heart South Wales on 105.7 MHz, and transmits national digital radio multiplexes for the BBC and Digital One multiplexes. In 2017, Nation Radio started broadcasting on 107.10 MHz. The transmitter signals were also received across the Irish sea in many parts of the east and south east coast of the Republic of Ireland, mainly in counties Dublin and Wicklow. From 1962 onward, many households in these counties would point their outdoor aerials towards the Irish sea and could receive transmission from this transmitter. When cable television launched in the early 1970s, the Welsh BBC and ITV stations were provided on the cable platform as these channels were mainly received in the Dublin and Wicklow counties.

Pentre Galar (or Pentregalar, Pentre-Galar) is a small settlement in the Preseli Mountains south of the village of Crymych, north Pembrokeshire, Wales, on the A478 Cardigan to Tenby road. The western part of the settlement lies in the parish of Mynachlog-ddu and the eastern part in Llanfyrnach parish.