Diosgydd (SH 775 579)
There has been a Significant Name Change to a hill that is listed in the 200m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail produced by Joe Nuttall in his surface analysis programme, with subsequent LIDAR analysis conducted by the DoBIH team and independently by Myrddyn Phillips.
LIDAR image of Diosgydd (SH 775 579) |
The criteria for the list that this name change
applies to are:
200m Twmpau
– Welsh hills at or above
200m and below 300m in height that have 30m minimum drop, with an accompanying sub list entitled the 200m
Sub-Twmpau, with the criteria for this sub category being all Welsh hills at or
above 200m and below 300m in height with 20m or more and below 30m of drop,
with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.
The 200m Twmpau by Myrddyn Phillips |
The hill is adjoined to the Carnedd Llywelyn group
of hills, which are situated in the
north-western part of North Wales (Region A, Sub-Region A1), and it is
positioned encircled by minor roads, with the A5 road farther to its
south-west, and has the town of Betws-y-coed towards the south-east.
The hill appeared in the
original Welsh 200m P30 list on Geoff Crowder’s v-g.me website, under the
invented and transposed name of Bryn
Diosgydd, with an accompanying note stating; Name from buildings to the West.
Bryn Diosgydd | 233m | SH775579 | 115 | 17 | Name from buildings to the West |
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; as was done
in this instance. 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 16 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 Diosgau in the
apportionments, with the details on the Tithe map appearing
in the parish of Betws-y-coed and in the county named as Caernarfonshire.
Extract from the apportionments |
Therefore, the name this hill
is now listed by in the 200m Twmpau is
Diosgydd, which is the prioritised plural of this name and this was derived from the
Tithe map.
The full details for the hill are:
Group: Carnedd
Llywelyn
Name: Diosgydd
Previously Listed Name:
Bryn Diosgydd
OS 1:50,000 map: 115
Summit Height: 233.05m (LIDAR)
Summit Grid Reference: SH 77503 57940 (LIDAR)
Bwlch Height: 202.85m (LIDAR)
Bwlch Grid Reference: SH 77793 57796 (LIDAR)
Drop: 30.2m (LIDAR)
Myrddyn Phillips
(October 2023)
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