GAT7212

Heneb Historic Environment Record

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Tidal Mill, Possible Site of, Felin-heli

Primary Reference Number (PRN) : 7212
Trust : Gwynedd
Community : Trearddur
Unitary authority : Ynys Mon
NGR : SH26577977
Site Type (preferred type first) : MEDIEVAL TIDE MILL

Description :
Exact location unknown. (Davidson & Jones, 1997)

Property called Felin-heli to the N could be the site SH26707990A. (Davidson, 2002)

This tidal mill is shown on the maps of 1845 and 1853. The mill pond was located to the west of Mill Island, though this area was filled in by 1887. In 1845 five buildings are shown round the mill. The area of the in-filled dam can be seen well on the aerial photographs. The earliest reference to this site is from 1524, but it is thought that the mill existed before then; the dam and millers cottage still remain (GAT 251). (Kenney, 2000)

A dam and sluice with evidence of additional structures associated with a tide mill first mentioned in 1524. The mill pond was formed from the area between the island (Ynys Wyddog, now more usually called Mill Island) and Holy Island. Dams were built at either end, and the mill was located alongside a sluice at the northern dam. The area is currently too overgrown to see if remains of the mill building survive. The water entered from the south end, presumably through sluice gates, and was then allowed to run out through the sluice at the north end, so driving the mill wheel. The mill house and former kiln lie a short distance to the north-east. The house is still occupied, and lies outside of the proposed development area. The mill is one of four tide mills lying on the strait between Holy Island and Anglesey, and was the first to be developed, also pre-dating a similar tide mill in the Menai Strait, for which the earliest evidence is c. 1590. (Cooke, Evans & Flook, 2010)

Sources :
Cooke, R., Evans, R. & Flook, M. , 2010 , Penrhos Leisure Village, Holyhead, Anglesey: Archaeological Assessment (

© GAT)

Events :
40362 : Coastal Erosion Survey: Anglesey (year : 1997)
44297 : The Medieval Mills of Anglesey: Archaeological Threat Related Assessment (year : 2002)
40556 : Land at Ty Mawr, Holyhead: Archaeological Assessment (year : 2000)
44657 : Penrhos Leisure Village, Holyhead, Anglesey (year : 2010)

Related records
National Monuments Record Wales NPRN 525369 https://coflein.gov.uk/en/site/525369/

Compiled date : 16-05-1997

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February 7, 2026, 2:49 pm

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