Mapping Mountains – Significant Name Changes – Y Trichant – The 300m Hills of Wales

Ffridd Dylasau Isaf (SH 817 511) 

There has been a Significant Name Change to a hill that is listed in the Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Ffridd Dylasau Isaf (SH 817 511)

The criteria for the list that this name change applies to are: 

Y Trichant – The 300m Hills of Wales.  Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The hill is adjoined to the Arenig group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A3), and it is positioned with the A5 road to its north and the B4406 road to its west, and has the village of Penmachno towards the west south-west. 

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was listed under the invented and transposed name of Pen y Hwylfa, with an accompanying note stating; Name from buildings to the South-East.

Pen y Hwylfa

371m

SH817512

116

18

Name from buildings to the South-East.

 

During my early hill listing I thought it appropriate to either invent a name for a hill, or use a name that appeared near to the summit of the hill on Ordnance Survey maps of the day.  My preference was to use farm names and put Pen, Bryn or Moel in front of them.  This is not a practice that I now advocate as with time and inclination place-name data can be improved either by asking local people or by examining historic documents, through this form of research an appropriate name for the hill can usually be found. 

Extract from the Ordnance Survey 1:25,000 Explorer map

As the summit of this hill comprises bounded land the details for it were examined on the Tithe map.  The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act.  This act allowed tithes to be paid in cash rather than goods.  The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land.  This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales. 

Extract from the Tithe map

The enclosed land where the summit of this hill is situated is given the number 1214 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land.  The land where the summit of this hill is situated is named as Ffridd Dylasau Isaf, with the details on the Tithe map appearing in the parish of Penmachno and in the county named as Caernarfon. 

Extract from the apportionments

Therefore, the name this hill is now listed by in the Y Trichant – The 300m Hills of Wales is Ffridd Dylasau Isaf and this was derived from the Tithe map. 

 

The full details for the hill are: 

Group:  Arenig 

Name:  Ffridd Dylasau Isaf 

Previously Listed Name:  Pen y Hwylfa 

OS 1:50,000 map:  116

Summit Height:  371.3m (LIDAR)                                                           

Summit Grid Reference:  SH 81747 51149 (LIDAR) 

Bwlch Height:  344.2m (LIDAR) 

Bwlch Grid Reference:  SH 81710 50665 (LIDAR) 

Drop:  27.1m (LIDAR) 

 

Myrddyn Phillips (May 2021)