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Tyn Twr

Also known as, or recorded in historical documents as;
Ty'n Twr; Twr Abercaseg; Llanllechid

In the community of Bethesda.
In the historic county of Caernarfonshire.
Modern authority of Gwynedd.
Preserved county of Gwynedd.

OS Map Grid Reference: SH62616600
Latitude 53.17336° Longitude -4.05734°

Tyn Twr has been described as a probable Timber Castle, and also as a Pele Tower although is doubtful that it was such.

There are cropmark/slight earthwork remains.

This site is a scheduled monument protected by law.


Ty'n-Twy Tower was a small medieval tower, possibly the Twr Abercaseg mentioned in 1254 that guarded the Ogwen crossing and approach to Nant Frangcon. The tower is mentioned as being transferred to the ownership of the Griffiths of Penrhyn in 1458. (Coflein–Reference: Cadw listed buildings database.)

The tower whose name survives in Pont y Twr and Ty'n-twr was perhaps a motte formed by revetting the boss of rock E of the bridge. Possible traces of an early wall can be detected on the NE, but the ground is now too much built over for certainty (RCAHMW). There is insufficient evidence to identify the 'boss' of rock, which is now densely overgrown as a motte (OS Record). (Gwynedd Archaeological Trust HER)

There is considerable medieval activity on the site, including a probable 14th century building, possibly overlying an earlier structure. Documentary evidence suggests a tower or some building of considerable significance stood on the boss of rock at this site during the 13th century. (Scheduling Report)

The location, where the A5 main Holyhead-London road comes out of the Snowdonian mountains, is excellent as a toll collection point. The form of the tower is unclear. Was this a timber tower on a rocky knoll or a masonry building (or both at various periods). Does not seem to have been anything more than one building.
Links to archaeological and architectural databases, mapping and other online resources

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Sources of information, references and further reading
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This record last updated 05/07/2016 22:00:40