Clytiau Poethion (SH 763 717)
There has been a Significant Name Change to a hill
that is now listed in the 100m Twmpau and Y Trechol – The Dominant Hills of Wales,
with the summit height and its location, the drop and status of the hill
confirmed by LIDAR analysis and its summit height subsequently confirmed by a Trimble
GeoXH 6000 survey, both conducted by Myrddyn Phillips, with the latter taking
place on the 10th October 2018.
LIDAR image of Clytiau Poethion (SH 763 717) |
The criteria for the two lists that this name
change applies to are:
100m Twmpau - Welsh hills at or above 100m and below 200m in height with 30m
minimum drop, with an accompanying sub list entitled the 100m Sub-Twmpau with the criteria for this sub category being all
Welsh hills at or above 100m and below 200m 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.
Y Trechol – The Dominant Hills of Wales – Welsh P30 hills whose
prominence equal or exceed half that of their absolute height. With the criteria for Lesser Dominant status being those additional Welsh P30 hills whose
prominence is between one third and half that of their absolute height. The list is authored by Myrddyn Phillips with
the Introduction to the start of the Mapping Mountains publication of this list
appearing on the 3rd December 2015.
The hill is adjoined to the
Carneddau group of hills, which are
situated in the north-western part of North Wales (Region A, Sub-Region A1),
and it is encircled by minor
roads with the B5106 and the Afon Conwy (River Conwy) to its east, and has the town of Conwy to its north.
The hill has not previously been listed as its
adjacent northerly hill of Maes Glas Mawr (SH 76876 72414) was thought to be
higher, LIDAR analysis and the survey with the Trimble GeoXH 6000 proved
otherwise and therefore Clytiau Poethion is now listed as the 100m Twmpau and the Lesser Dominant hill.
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 195 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 Clylliau [sic] Poethion
in the apportionments, with the details on the Tithe map appearing in the parish of Caerhun and in the
county named as Caernarvonshire [sic].
Extract from the apportionments |
Therefore, the name this hill is now listed by in
the 100m Twmpau and Y Trechol – The Dominant Hills of Wales is
Clytiau Poethion, and this name was derived from the Tithe map.
The full details for the hill are:
Group: Carneddau
Name: Clytiau Poethion
Previously Listed Name:
not previously listed
OS 1:50,000 map: 115
Summit Height: 109.1m
(converted to OSGM15)
Summit Grid Reference:
SH 76337 71799
Bwlch Height: 68.7m
(LIDAR)
Bwlch Grid Reference:
SH 77496 72493 (LIDAR)
Drop: 40.35m (Trimble
summit and LIDAR bwlch)
Dominance: 37.00%
(Trimble summit and LIDAR bwlch)
Myrddyn Phillips (March 2019)
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