Dating in gwynedd
The CHERISH team have also been coring and sampling in the surrounding former wetlands to the east of the hillfort and initial results are promising.
Sediment cores have been obtained from 2 locations to hopefully provide a palaeoenvironmental context for the occupation phase of the fort.
3859 (although Llywarch's name does not appear here, mention is made of some of his contemporary relations in the genealogiae Saxonum which are attached to the text of Nennius), B. Towards the middle of the 9th century, during a period of adversity for Powys, a story-teller of that province composed a cycle of tales about Llywarch and his sons.
He was, both on the paternal and the maternal side, a cousin of Urien of Rheged who fought against the sons of Ida in the latter half of the 6th century; and the princes of Gwynedd, and other Welsh provinces, were descended from him through Merfyn Frych and Rhodri Mawr.
1026-49 (although a few also appear in earlier MSS).
These contained englynion, which alone are extant as a result of having been copied into the Red Book of Hergest, col.
It is difficult to say precisely how much of the hillfort has been lost since its construction but measuring cliff top positions using Ordnance Survey mapping we calculate that between 20 to 40 metres of the western side has been lost since 1900.
Assuming that future rates of erosion will be higher than those observed over the last 117 years, due to climate change, Dinas Dinlle could be completely lost within 500 years.
It was surveyed by the Royal Commission in 1949, and its condition then was only ‘fair’.
It is set on a hill of glacial drift sediments (specifically a thrust-block moraine) overlooking the sea and Caernarfonshire coastal plain.
The hillfort and Second World War seagull trench on the northern slopes of the fort are protected as Scheduled Monuments by Cadw and the hill is a Site of Special Scientific Interest (SSSI), designated for the importance of the glacial sediments, clearly seen in the exposed sections of till, sand and gravel in the cliff face.
Ongoing work by Birkbeck, University of London, with Aberystwyth University and CHERISH to date the sand spit of Morfa Dinlle north of the fort (using OSL/Luminescence dating) suggests it only dates back to Roman times.
This means that the sea – or salt marsh – may have extended from the northern foot of Dinas Dinlle (where the village is now) in the later Iron Age.
Recent history In the early 20th century the hillfort formed part of a golf course, whilst during the Second World War a pill box, seagull trench and observation post were constructed on the northern slopes to protect nearby RAF Llandwrog – now Caernarfon Airport.