[1] The village straddles the A478 former drovers' road which runs from Cardigan in Ceredigion south to Tenby, is surrounded by farmland, and is in the heart of Welsh-speaking Pembrokeshire with a rich history and associated folklore.

According to Thomas Morgan (1912), Blaenffos takes its name "from a farmhouse so called, signifying the head of the ditch" (Welsh: blaen ffôs).

[3] Local evidence indicates that the area that is now Blaenffos would have been farmed at least as far back as the Bronze Age over 3,000 years ago, and possibly earlier.

Richard Fenton, who visited Frenni Fawr in the early 19th century to excavate the barrows recorded the tradition of a treasure-chest hidden on the hill, guarded by a horrible spectre.

Pembrokeshire Local Action Network for Enterprise and Development (PLANED) quotes: In the Mabinogi tale "Breuddwyd Macsen" (The Dream of Maxen), the Roman Emperor Magnus Maximus is said to have made camp on the Frenni Fawr.

[4] PLANED also quotes the myth that: The Tylwyth Teg or Fairy Folk were believed to frequent the Frenni Fawr in the past.

The boundary between the former parishes of Llanfihangel Penbedw and Castellan Chapelry (part of Penrydd) runs through the old centre of the village at the bottom of the hill.

New House was closed in 1914 under the Defence of the Realm Act, with compensation of £400 paid[10] and New Inn existed at least until 1918;[11] these three pubs subsequently became private dwellings.

As well as the Baptist Chapel (see below) two post-mediaeval buildings in Blaenffos were noted by the 2008 Royal Commission on the Ancient and Historical Monuments of Wales[12] - Hafod,[13] a two-roomed stone cottage standing by the main road and Rafel, a substantial house with a (modern) plaque stating "1784".

In 1889 the "compact and valuable" Clover Hill Farm, comprising house, shop, outbuildings and 13 acres, 3 roods, 19 poles of land (5.6 hectares) was sold at auction for £515.

[19] Blaenffos was relatively remote even towards the end of the 19th century: resident Dan Evans froze to death after losing his way in the snow trying to get home after dark in January 1887.

In February 1886 the press reported that Mr Samuel, Railway Cashier at Boncath, had given the children of Blaenffos School (see Education, below) a magic lantern entertainment.

[3] People of Blaenffos did not escape the First World War; a regional newspaper carried an advertisement and photograph placed by a mother appealing for news of her son who was missing while serving with the Welsh Regiment.

[11] There was a Blaenffos branch of the Cardigan and District temperance movement; the Pembrokeshire Records Office holds the singing festival minute book of 1925-1969 (document reference number HDX/1729).